MORGAN STANLEY DEAN WITTER US GOVERNMENT MONEY MARKET TRUST
497, 2000-03-21
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<PAGE>
                                                     PROSPECTUS - MARCH 20, 2000

Morgan Stanley Dean Witter
                                              U.S. GOVERNMENT MONEY MARKET TRUST

                                 [COVER PHOTO]

                                       A MONEY MARKET FUND THAT SEEKS TO PROVIDE
                                             SECURITY OF PRINCIPAL, HIGH CURRENT
                                                            INCOME AND LIQUIDITY

  The Securities and Exchange Commission has not approved or disapproved these
                           securities or passed upon
    the adequacy of this PROSPECTUS. Any representation to the contrary is a
                               criminal offense.
<PAGE>
CONTENTS

<TABLE>
<S>                       <C>                                                     <C>
The Fund                  Investment Objectives.................................                   1
                          Principal Investment Strategies.......................                   1
                          Principal Risks.......................................                   2
                          Past Performance......................................                   3
                          Fees and Expenses.....................................                   3
                          Fund Management.......................................                   4

Shareholder Information   Pricing Fund Shares...................................                   5
                          How to Buy Shares.....................................                   5
                          How to Exchange Shares................................                   7
                          How to Sell Shares....................................                   9
                          Distributions.........................................                  12
                          Tax Consequences......................................                  12
Financial Highlights      ......................................................                  14

Financial Statements --
January 31, 2000          ......................................................                  15

Our Family of Funds       ......................................................   Inside Back Cover

                          THIS PROSPECTUS CONTAINS IMPORTANT INFORMATION ABOUT THE FUND. PLEASE READ
                          IT CAREFULLY AND KEEP IT FOR FUTURE REFERENCE.
</TABLE>
<PAGE>
[Sidebar]
MONEY MARKET
A MUTUAL FUND HAVING THE GOAL TO SELECT SECURITIES TO PROVIDE CURRENT INCOME
WHILE SEEKING TO MAINTAIN A STABLE SHARE PRICE OF $1.00.
YIELD
THE FUND'S YIELD REFLECTS THE ACTUAL INCOME THE FUND PAYS TO YOU EXPRESSED AS A
PERCENTAGE OF THE FUND'S SHARE PRICE. BECAUSE THE FUND'S INCOME FROM ITS
PORTFOLIO SECURITIES WILL FLUCTUATE, THE INCOME IT IN TURN DISTRIBUTES TO YOU
AND THE FUND'S YIELD WILL VARY.
[End Sidebar]

THE FUND

[ICON]  INVESTMENT OBJECTIVES
- --------------------------------------------------------------------------------
           Morgan Stanley Dean Witter U.S. Government Money Market Trust (the
           "Fund") is a money market fund that seeks to provide security of
           principal, high current income and liquidity.

[ICON]  PRINCIPAL INVESTMENT STRATEGIES
- --------------------------------------------------------------------------------
             The Fund will invest in high quality, short-term U.S. Government
             securities. The Fund's "Investment Manager," Morgan Stanley Dean
             Witter Advisors Inc., seeks to maintain the Fund's share price at
             $1.00. The share price remaining stable at $1.00 means that the
             Fund would preserve the principal value of your investment.
             The U.S. Government securities that the Fund may purchase include:
                            - U.S. Treasury bills, notes and bonds, all of which
                              are direct obligations of the U.S. Government.
                            - Securities issued by agencies and
                              instrumentalities of the U.S. Government which are
                              backed by the full faith and credit of the United
                              States. Among the agencies and instrumentalities
                              issuing these obligations are the Government
                              National Mortgage Association and the Federal
                              Housing Administration.
                            - Securities issued by agencies and
                              instrumentalities which are not backed by the full
                              faith and credit of the United States, but whose
                              issuing agency or instrumentality has the right to
                              borrow, to meet its obligations, from the U.S.
                              Treasury. Among these agencies and
                              instrumentalities are the Federal National
                              Mortgage Association, the Federal Home Loan
                              Mortgage Corporation and the Federal Home Loan
                              Banks.
                            - Securities issued by agencies and
                              instrumentalities which are backed solely by the
                              credit of the issuing agency or instrumentality.
                              Among these agencies and instrumentalities is the
                              Federal Farm Credit System.

             The Fund also may invest up to 10% of its assets in FDIC insured
             certificates of deposit of banks and saving and loan institutions.
             The Fund's policies discussed above are fundamental. These policies
             may not be changed without shareholder approval. In addition to the
             fundamental investment policies, the Fund may invest in repurchase
             agreements. Repurchase agreements are contracts in which a
             financial institution sells a security and agrees to buy it back on
             a specific date (usually within 7 days) and at a higher price,
             which reflects an agreed-upon interest rate.

                                                                               1
<PAGE>
[ICON]  PRINCIPAL RISKS
- --------------------------------------------------------------------------------
             There is no assurance that the Fund will achieve its investment
             objectives.

            CREDIT AND INTEREST RATE RISKS. A principal risk of investing in the
             Fund is associated with its U.S. Government securities investments,
             which are subject to two types of risks: credit risk and interest
             rate risk. Credit risk refers to the possibility that the issuer of
             a security will be unable to make interest payments and repay the
             principal on its debt. Interest rate risk, another risk of debt
             securities, refers to fluctuations in the value of a fixed-income
             security resulting from changes in the general level of interest
             rates.

             Credit risk is minimal with respect to the Fund's U.S. Government
             securities investments. Repurchase agreements involve a greater
             degree of credit risk. The Investment Manager, however, actively
             manages the Fund's assets to reduce the risk of losing any
             principal investment as a result of credit or interest rate risks.
             In addition, federal regulations require money market funds, such
             as the Fund, to invest only in debt obligations of high quality and
             short maturities.

             Shares of the Fund are not bank deposits and are not insured or
             guaranteed by the FDIC or any other government agency. Although the
             Fund seeks to preserve the value of your investment at $1.00 per
             share, if it is unable to do so, it is possible to lose money by
             investing in the Fund.

 2
<PAGE>
[Sidebar]
ANNUAL TOTAL RETURNS
THIS CHART SHOWS HOW THE PERFORMANCE OF THE FUND'S SHARES HAS VARIED FROM YEAR
TO YEAR OVER THE PAST 10 CALENDAR YEARS.
AVERAGE ANNUAL
TOTAL RETURNS
THIS TABLE SHOWS THE FUND'S AVERAGE ANNUAL RETURNS.
ANNUAL FUND
OPERATING EXPENSES
THESE EXPENSES ARE DEDUCTED FROM THE FUND'S ASSETS AND ARE BASED ON EXPENSES
PAID FOR THE FISCAL YEAR ENDED JANUARY 31, 2000.
[End Sidebar]

[ICON]  PAST PERFORMANCE
- --------------------------------------------------------------------------------
           The bar chart and table below provide some indication of the risks of
           investing in the Fund. For the Fund's most recent 7-day annualized
           yield, you may call (800) 869-NEWS. The Fund's past performance does
           not indicate how the Fund will perform in the future.

ANNUAL TOTAL RETURNS - CALENDAR YEARS

EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC

<TABLE>
<S>  <C>
1990 7.35%
`91  5.37%
`92  3.03%
`93  2.29%
`94  3.22%
`95  5.02%
`96  4.47%
`97  4.63%
`98  4.71%
`99  4.38%
</TABLE>

             During the periods shown in the bar chart, the highest return for a
             calendar quarter was 1.83% (quarter ended March 31, 1990) and the
             lowest return for a calendar quarter was 0.55% (quarter ended
             June 30, 1993).


<TABLE>
<CAPTION>
AVERAGE ANNUAL TOTAL RETURNS (AS OF DECEMBER 31, 1999)
- -----------------------------------------------------------------------------
                                     PAST 1 YEAR  PAST 5 YEARS  PAST 10 YEARS
<S>                                  <C>          <C>           <C>
- -----------------------------------------------------------------------------
 U.S. Government Money Market Trust     4.38%        4.64%          4.44%
- -----------------------------------------------------------------------------
</TABLE>


[ICON]  FEES AND EXPENSES
- --------------------------------------------------------------------------------
           The Fund is a no-load fund. The Fund does not impose any sales
           charges and does not impose account or exchange fees. The table below
           briefly describes the fees and expenses that you may pay if you buy
           and hold shares of the Fund.

<TABLE>
<S>                                                           <C>
 ANNUAL FUND OPERATING EXPENSES
- ----------------------------------------------------------------------
 Management Fee                                               0.45%
- ----------------------------------------------------------------------
 Distribution and service (12b-1) fees                        0.08%
- ----------------------------------------------------------------------
 Other expenses                                               0.31%
- ----------------------------------------------------------------------
 Total annual Fund operating expenses                         0.84%
- ----------------------------------------------------------------------
</TABLE>

                                                                               3
<PAGE>
[Sidebar]
MORGAN STANLEY DEAN WITTER ADVISORS INC.
THE INVESTMENT MANAGER IS WIDELY RECOGNIZED AS A LEADER IN THE MUTUAL FUND
INDUSTRY AND TOGETHER WITH MORGAN STANLEY DEAN WITTER SERVICES COMPANY INC., ITS
WHOLLY-OWNED SUBSIDIARY, HAD APPROXIMATELY $155 BILLION IN ASSETS UNDER
MANAGEMENT AS OF FEBRUARY 29, 2000.
[End Sidebar]

           EXAMPLE
           This example is intended to help you compare the cost of investing in
           the Fund with the cost of investing in other mutual funds.

           The example assumes that you invest $10,000 in the Fund, your
           investment has a 5% return each year, and the Fund's operating
           expenses remain the same. Although your actual costs may be higher or
           lower, the table below shows your costs at the end of each period
           based on these assumptions.

<TABLE>
<CAPTION>
                                     ---------------------------------------------------
                                                      1 YEAR  3 YEARS  5 YEARS  10 YEARS
                                     <S>              <C>     <C>      <C>      <C>
                                     ---------------------------------------------------
                                                       $86     $268     $466     $1,037
                                     ---------------------------------------------------
</TABLE>

[ICON]  FUND MANAGEMENT
- --------------------------------------------------------------------------------
             The Fund has retained the Investment Manager -- Morgan Stanley Dean
             Witter Advisors Inc. -- to provide administrative services, manage
             its business affairs and invest its assets, including the placing
             of orders for the purchase and sale of portfolio securities. The
             Investment Manager is a wholly-owned subsidiary of Morgan Stanley
             Dean Witter & Co., a preeminent global financial services firm that
             maintains leading market positions in each of its three primary
             businesses: securities, asset management and credit services. Its
             main business office is located at Two World Trade Center, New
             York, NY 10048.

             The Fund pays the Investment Manager a monthly management fee as
             full compensation for the services and facilities furnished to the
             Fund, and for Fund expenses assumed by the Investment Manager. The
             fee is based on the Fund's average daily net assets. For the fiscal
             year ended January 31, 2000 the Fund accrued total compensation to
             the Investment Manager amounting to 0.45% of the Fund's average
             daily net assets.

 4
<PAGE>

[Sidebar]
CONTACTING A
FINANCIAL ADVISOR
IF YOU ARE NEW TO THE MORGAN STANLEY DEAN WITTER FAMILY OF FUNDS AND WOULD LIKE
TO CONTACT A FINANCIAL ADVISOR, CALL (877) 937-MSDW (TOLL-FREE) FOR THE
TELEPHONE NUMBER OF THE MORGAN STANLEY DEAN WITTER OFFICE NEAREST YOU.
YOU MAY ALSO ACCESS OUR OFFICE LOCATOR ON OUR INTERNET SITE AT:
www.msdw.com/individual/funds

[End Sidebar]

SHAREHOLDER INFORMATION

[ICON]  PRICING FUND SHARES
- --------------------------------------------------------------------------------
           The price of Fund shares, called "net asset value," is based on the
           amortized cost of the Fund's portfolio securities. The amortized cost
           valuation method involves valuing a debt obligation in reference to
           its cost, rather than market forces.

           The net asset value per share of the Fund is determined once daily at
           4:00 p.m. Eastern time on each day that the New York Stock Exchange
           is open (or, on days when the New York Stock Exchange closes prior to
           4:00 p.m., at such earlier time). Shares will not be priced on days
           that the New York Stock Exchange is closed.

[ICON]  HOW TO BUY SHARES
- --------------------------------------------------------------------------------
             You may open a new account to buy Fund shares or buy additional
             Fund shares for an existing account in several ways. When you buy
             Fund shares, the shares are purchased at the next share price
             calculated after we receive your purchase order accompanied by
             federal or other immediately available funds. You begin earning
             dividends the business day after the shares are purchased. We
             reserve the right to reject any order for the purchase of Fund
             shares.

<TABLE>
<CAPTION>
                                     MINIMUM INVESTMENT AMOUNTS
                                     --------------------------------------------------------------------------------------------
                                                                                                           MINIMUM INVESTMENT
                                                                                                        -------------------------
                                     INVESTMENT OPTIONS                                                    INITIAL     ADDITIONAL
                                     <S>                           <C>                                  <C>            <C>
                                     --------------------------------------------------------------------------------------------
                                      Regular Accounts:
                                                                                                        $       1,000    $ 50
                                     --------------------------------------------------------------------------------------------
                                      Individual Retirement
                                      Accounts:                    Regular IRAs
                                                                                                        $       1,000    $ 50
                                                                   Education IRAs
                                                                                                        $         500    $ 50
                                     --------------------------------------------------------------------------------------------
                                      EASYINVEST-SM-
                                      (Automatically from your
                                      checking or savings account
                                      or Money Market Fund)
                                                                                                        not available    $100
                                     --------------------------------------------------------------------------------------------
</TABLE>

             There is no minimum investment amount if you purchase Fund shares
             through: (1) the Investment Manager's mutual fund asset allocation
             plan, (2) a program, approved by the Fund's distributor, in which
             you pay an asset-based fee for advisory, administrative and/or
             brokerage services, or (3) employer-sponsored employee benefit plan
             accounts. In addition, the Fund will waive the minimum initial
             investment for the automatic reinvestment of distributions from
             certain unit investment trusts.

                                                                               5
<PAGE>

<TABLE>
<CAPTION>
                INVESTMENT
                OPTIONS             PROCEDURES
                <S>                 <C>
                --------------------------------------------------------------------------------
                 Contact Your       NEW ACCOUNTS AND SUBSEQUENT INVESTMENTS
                 Financial Advisor  You may buy Fund shares by contacting your Morgan Stanley
                                    Dean Witter Financial Advisor or other authorized financial
                 ICON               representative. Your Financial Advisor will assist you,
                                    step-by-step, with the procedures to invest in the Fund.
                --------------------------------------------------------------------------------
                 By Mail            NEW ACCOUNTS
                 ICON               To open a new account to buy Fund shares:
                                    - Complete and sign the attached Application.
                                    - Make out a check for the investment amount to: Morgan
                                      Stanley Dean Witter U.S. Government Money Market Trust.
                                    - Mail the Application and check to Morgan Stanley Dean
                                      Witter Trust FSB at P.O. Box 1040, Jersey City, NJ 07303.
                                    ------------------------------------------------------------
                                    SUBSEQUENT INVESTMENTS
                                    To buy additional shares for an existing Fund account:
                                    - Write a "letter of instruction" to the Fund specifying the
                                      name(s) on the account, the account number and the social
                                      security or tax identification number, and the additional
                                      investment amount. The letter must be signed by the
                                      account owner(s).
                                    - Make out a check for the investment amount to: Morgan
                                      Stanley Dean Witter U.S. Government Money Market Trust.
                                    - Mail the letter and check to Morgan Stanley Dean Witter
                                      Trust FSB at the same address as for new accounts.
                --------------------------------------------------------------------------------
                 By wire            NEW ACCOUNTS
                 ICON               To open a new account to buy Fund shares:
                                    - Mail the attached Application, completed and signed, to
                                      Morgan Stanley Dean Witter Trust FSB at P.O. Box 1040,
                                      Jersey City, NJ 07303.
                                    - Before sending instructions by wire, call us at
                                      (800) 869-NEWS advising us of your purchase and to confirm
                                      we have received your Application (at that time we will
                                      provide you with a new account number).
                                    - Wire the instructions specifying the name of the Fund and
                                      your account number, along with the additional investment
                                      amount, to The Bank of New York, for credit to the account
                                      of "Morgan Stanley Dean Witter Trust FSB, Harborside
                                      Financial Center, Plaza Two, Jersey City, NJ 07303,
                                      Account No. 8900188413."
                                    (When you buy Fund shares, wire purchase instructions
                                    received by Morgan Stanley Dean Witter Trust FSB prior to
                                    12:00 noon Eastern time are normally effective that day and
                                    wire purchase instructions received after 12:00 noon are
                                    normally effective the next business day.)
                                    ------------------------------------------------------------
                                    SUBSEQUENT INVESTMENTS
                                    To buy additional shares for an existing Fund account:
                                    - Before sending instructions by wire, call us at
                                      (800) 869-NEWS advising us of your purchase.
                                    - Wire the instructions specifying the name of the Fund and
                                      your account number, along with the investment amount, to
                                      The Bank of New York, for credit to the account of Morgan
                                      Stanley Dean Witter Trust FSB in the same manner as
                                      opening an account.
                                    (Also, when you buy additional Fund shares, wire purchase
                                    instructions received by Morgan Stanley Dean Witter Trust
                                    FSB prior to 12:00 noon Eastern time are normally effective
                                    that day and wire purchase instructions received after
                                    12:00 noon are normally effective the next business day.)
                --------------------------------------------------------------------------------
</TABLE>

 6
<PAGE>

<TABLE>
<CAPTION>
                INVESTMENT
                OPTIONS             PROCEDURES
                <S>                 <C>
                --------------------------------------------------------------------------------
                 EASYINVEST -SM-    NEW ACCOUNTS
                 (Automatically     This program is not available to open a new Fund account or
                 from your          a new account of another Money Market Fund.
                 checking or        ------------------------------------------------------------
                 savings            SUBSEQUENT INVESTMENTS
                 account)           EASYINVEST-SM- is a purchase plan that allows you to
                                    transfer money automatically from your checking or savings
                                    account to an existing Fund account on a
                ICON
                                    semi-monthly, monthly or quarterly basis. Contact your
                                    Morgan Stanley Dean Witter Financial Advisor for further
                                    information about this service.
                --------------------------------------------------------------------------------
</TABLE>

            ADDITIONAL PURCHASE INFORMATION. If you are a customer of Dean
             Witter Reynolds or another authorized dealer of Fund shares, you
             may upon request: (a) have the proceeds from the sale of listed
             securities invested in Fund shares the day after you receive the
             proceeds; and (b) pay for the purchase of certain listed securities
             by automatic sale of Fund shares that you own. If you are a
             customer of Dean Witter Reynolds or another authorized dealer of
             the Fund's shares, you may have cash balances in your securities
             account of $1,000 or more automatically invested in shares of the
             Fund on the next business day after the balance is accrued in your
             account. Cash balances of less than $1,000 may be automatically
             invested in Fund shares on a weekly basis.
            PLAN OF DISTRIBUTION. The Fund has adopted a Plan of Distribution in
             accordance with Rule 12b-1 under the Investment Company Act of
             1940. The Plan allows the Fund to pay distribution fees of up to
             0.15% of its average daily net assets for the sale and distribution
             of Fund shares. It also allows the Fund to pay for services to
             shareholders. Because these fees are paid out of the Fund's assets
             on an ongoing basis, over time these fees will increase the cost of
             your investment and may cost you more than paying other types of
             sales charges.

[ICON]  HOW TO EXCHANGE SHARES
- --------------------------------------------------------------------------------
            PERMISSIBLE FUND EXCHANGES. You may only exchange shares of the Fund
             for shares of other continuously offered Morgan Stanley Dean Witter
             Funds if the Fund shares were acquired in an exchange of shares
             initially purchased in a Multi-Class Fund or an FSC Fund (subject
             to a front-end sales charge). In that case, the shares may be
             subsequently re-exchanged for shares of the same Class of any
             Multi-Class Fund or FSC Fund or for shares of another Money Market
             Fund, a No-Load Fund, North American Government Income Trust, or
             Short-Term U.S. Treasury Trust. Of course, if an exchange is not
             permitted, you may sell shares of the Fund and buy another fund's
             shares with the proceeds.

             See the inside back cover of this PROSPECTUS for each Morgan
             Stanley Dean Witter Fund's designation as a Multi-Class Fund, FSC
             Fund, No-Load Fund or Money Market Fund. If a Morgan Stanley Dean
             Witter Fund is not listed, consult the inside back cover of that
             fund's prospectus for its designation. For purposes of exchanges,
             shares of FSC Funds are treated as Class A shares of a Multi-Class
             Fund.

                                                                               7
<PAGE>
           The current prospectus for each fund describes its investment
           objective(s), policies and investment minimums, and should be read
           before investing.
           EXCHANGE PROCEDURES. You can process an exchange by contacting your
           Morgan Stanley Dean Witter Financial Advisor or other authorized
           financial representative. Otherwise, you must forward an exchange
           privilege authorization form to the Fund's transfer agent -- Morgan
           Stanley Dean Witter Trust FSB -- and then write the transfer agent or
           call (800) 869-NEWS to place an exchange order. You can obtain an
           exchange privilege authorization form by contacting your Financial
           Advisor or other authorized financial representative or by calling
           (800) 869-NEWS.
           An exchange to any Morgan Stanley Dean Witter Fund (except a Money
           Market Fund) is made on the basis of the next calculated net asset
           values of the Funds involved after the exchange instructions are
           accepted. When exchanging into a Money Market Fund, the Fund's shares
           are sold at their next calculated net asset value and the Money
           Market Fund's shares are purchased at their net asset value on the
           following business day.
             The Fund may terminate or revise the exchange privilege upon
             required notice. The check writing privilege is not available for
             Money Market Fund shares you acquire in an exchange.
            TELEPHONE EXCHANGES. For your protection when calling Morgan Stanley
             Dean Witter Trust FSB, we will employ reasonable procedures to
             confirm that exchange instructions communicated over the telephone
             are genuine. These procedures may include requiring various forms
             of personal identification such as name, mailing address, social
             security or other tax identification number. Telephone instructions
             also may be recorded.
             Telephone instructions will be accepted if received by the Fund's
             transfer agent between 9:00 a.m. and 4:00 p.m. Eastern time on any
             day the New York Stock Exchange is open for business. During
             periods of drastic economic or market changes, it is possible that
             the telephone exchange procedures may be difficult to implement,
             although this has not been the case with the Fund in the past.
            MARGIN ACCOUNTS. If you have pledged your Fund shares in a margin
             account, contact your Morgan Stanley Dean Witter Financial Advisor
             or other authorized financial representative regarding restrictions
             on the exchange of such shares.
            EXCHANGING SHARES OF ANOTHER FUND SUBJECT TO A CONTINGENT DEFERRED
            SALES CHARGE ("CDSC"). There are special considerations when you
             exchange shares subject to a CDSC of another Morgan Stanley Dean
             Witter Fund for shares of the Fund. When determining the length of
             time you held the shares and the corresponding CDSC rate, any
             period (starting at the end of the month) during which you held
             shares of the Fund WILL NOT BE COUNTED. Thus, in effect the
             "holding period" for purposes of calculating the CDSC is frozen
             upon exchanging into the Fund. Nevertheless, if shares subject to a
             CDSC are exchanged for shares of the Fund, you will receive a
             credit when you sell the

 8
<PAGE>
             shares equal to the distribution (12b-1) fees, if any, you paid on
             those shares while in the Fund up to the amount of any applicable
             CDSC. See the prospectus of the fund that charges the CDSC for more
             details.
            LIMITATIONS ON EXCHANGES. Certain patterns of exchanges may result
             in the Fund limiting or prohibiting, at its discretion, additional
             purchases and/or exchanges. Determinations in this regard may be
             based on the frequency or dollar amount of previous exchanges. The
             Fund will notify you in advance of limiting your exchange
             privileges.
             For further information regarding exchange privileges, you should
             contact your Morgan Stanley Dean Witter Financial Advisor or call
             (800) 869-NEWS.

[ICON]  HOW TO SELL SHARES
- --------------------------------------------------------------------------------
             You can sell some or all of your Fund shares at any time. Your
             shares will be sold at the next share price calculated after we
             receive your order to sell as described below.

<TABLE>
<CAPTION>
                OPTIONS             PROCEDURES
                <S>                 <C>
                --------------------------------------------------------------------------------
                 Contact your       To sell your shares, simply call your Morgan Stanley Dean
                 Financial Advisor  Witter Financial Advisor or other authorized financial
                 ICON               representative.
                                    ------------------------------------------------------------
                                    Payment will be sent to the address to which the account is
                                    registered or deposited in your brokerage account.
                --------------------------------------------------------------------------------
                 Check-writing      You may order a supply of blank checks by requesting them on
                 Option             the investment application or by contacting your Morgan
                 ICON               Stanley Dean Witter Financial Advisor.
                                    ------------------------------------------------------------
                                    Checks may be written in any amount not less than $500. You
                                    must sign checks exactly as their shares are registered. If
                                    the account is a joint account, the check may contain one
                                    signature unless the joint owners have specified on an
                                    investment application that all owners are required to sign
                                    checks.
                                    ------------------------------------------------------------
                                    Payment of check proceeds normally will be made on the next
                                    business day after we receive your check in proper form.
                                    Shares purchased by check (including a certified or bank
                                    cashier's check) are not normally available to cover
                                    redemption checks until fifteen days after Morgan Stanley
                                    Dean Witter Trust FSB receives the check used for
                                    investment. A check will not be honored in an amount
                                    exceeding the value of the account at the time the check is
                                    presented for payment.
                --------------------------------------------------------------------------------
</TABLE>

                                                                               9
<PAGE>

<TABLE>
<CAPTION>
                OPTIONS             PROCEDURES
                <S>                 <C>
                --------------------------------------------------------------------------------
                 Systematic         If your investment in all of the Morgan Stanley Dean Witter
                 Withdrawal Plan    Family of Funds has a total market value of at least
                 ICON               $10,000, you may elect to withdraw amounts of $25 or more,
                                    or in any whole percentage of a Fund's balance (provided the
                                    amount is at least $25), on a monthly, quarterly,
                                    semi-annual or annual basis, from any Fund with a balance of
                                    at least $1,000. Each time you add a Fund to the plan, you
                                    must meet the plan requirements.
                                    ------------------------------------------------------------
                                    To sign up for the Systematic Withdrawal Plan, contact your
                                    Morgan Stanley Dean Witter Financial Advisor or call
                                    (800) 869-NEWS. You may terminate or suspend your plan at
                                    any time. Please remember that withdrawals from the plan are
                                    sales of shares, not Fund "distributions," and ultimately
                                    may exhaust your account balance. The Fund may terminate or
                                    revise the plan at any time.
                                    ------------------------------------------------------------
                                    When you sell Fund shares through the Systematic Withdrawal
                                    Plan, the shares may be subject to a contingent deferred
                                    sales charge ("CDSC") if they were obtained in exchange for
                                    shares subject to a CDSC of another Morgan Stanley Dean
                                    Witter Fund. The CDSC, however, will be waived in an amount
                                    up to 12% annually of the Fund's value, although Fund shares
                                    with no CDSC will be sold first, followed by those with the
                                    lowest CDSC. As such, the waiver benefit will be reduced by
                                    the amount of your shares that are not subject to a CDSC.
                                    See the prospectus of the Fund that charges the CDSC for
                                    more details.
                --------------------------------------------------------------------------------
                 By Letter          You may also sell your shares by writing a "letter of
                 ICON               instruction" that includes:
                                    - your account number;
                                    - the dollar amount or the number of shares you wish to
                                      sell; and
                                    - the signature of each owner as it appears on the account.
                                    ------------------------------------------------------------
                                    If you are requesting payment to anyone other than the
                                    registered owner(s) or that payment be sent to any address
                                    other than the address of the registered owner(s) or
                                    pre-designated bank account, you will need a signature
                                    guarantee. You can obtain a signature guarantee from an
                                    eligible guarantor acceptable to Morgan Stanley Dean Witter
                                    Trust FSB. (You should contact Morgan Stanley Dean Witter
                                    Trust FSB at (800)869-NEWS for a determination as to whether
                                    a particular institution is an eligible guarantor.) A notary
                                    public CANNOT provide a signature guarantee. Additional
                                    documentation may be required for shares held by a
                                    corporation, partnership, trustee or executor.
                                    ------------------------------------------------------------
                                    Mail the letter to Morgan Stanley Dean Witter Trust FSB at
                                    P.O. Box 983, Jersey City, NJ 07303.
                                    ------------------------------------------------------------
                                    A check will be mailed to the name(s) and address in which
                                    the account is registered, or otherwise according to your
                                    instructions.
                --------------------------------------------------------------------------------
                 By Telephone or    To sell shares by telephone or wire, first complete a
                 Wire               telephone redemption application designating a bank account.
                 ICON               Redemptions for more than $1,000 will be wired to your bank
                 ICON               account (your bank may charge a fee for this service). For
                                    redemptions for less than $1,000, a check will be mailed to
                                    your bank account. For more information or to request a
                                    telephone redemption application, call Morgan Stanley Dean
                                    Witter Trust FSB at (800) 869-NEWS.
                --------------------------------------------------------------------------------
</TABLE>

            PAYMENT FOR SOLD SHARES. After we receive your complete instructions
             to sell as described above, a check will be mailed to you within
             seven days, although we will attempt to make payment within one
             business day. Payment may also be sent to your brokerage account.

 10
<PAGE>
             Payment may be postponed or the right to sell your shares
             suspended, however, under unusual circumstances. If you request to
             sell shares that were recently purchased by check, your sale will
             not be effected until it has been verified that the check has been
             honored.
            INVOLUNTARY SALES. The Fund reserves the right, on sixty days'
             notice, to sell the shares of any shareholder whose shares, due to
             sales by the shareholder, have a value below $500. However, before
             the Fund sells your shares in this manner, we will notify you and
             allow you sixty days to make an additional investment in an amount
             that will increase the value of your account to at least the
             required amount before the sale is processed.
            MONEY MARKET FUND AUTOMATIC SALE PROCEDURES. If you maintain a
             brokerage account with Dean Witter Reynolds or another authorized
             dealer of Fund shares, you may elect to have your Fund shares
             automatically sold from your account to satisfy amounts you owe as
             a result of purchasing securities or other transactions in your
             brokerage account.
             If you elect to participate by notifying Dean Witter Reynolds or
             another authorized dealer of Fund shares, your brokerage account
             will be scanned each business day prior to the close of business
             (4:00 p.m. Eastern time). After any cash balances in the account
             are applied, a sufficient number of Fund shares may be sold to
             satisfy any amounts you are obligated to pay to Dean Witter
             Reynolds or another authorized dealer of fund shares.
             Sales will be effected on the business day before the date you are
             obligated to make payment, and Dean Witter Reynolds or another
             authorized dealer of Fund shares will receive the sale proceeds on
             the following day.
            EASYINVEST -SM- -- AUTOMATIC REDEMPTION. You may invest in shares of
             certain other Morgan Stanley Dean Witter Funds by subscribing to
             EASYINVEST -SM-, an automatic purchase plan that provides for the
             automatic investment of any amount from $100 to $5,000 in shares of
             the specified fund. Under EASYINVEST -SM-, you may direct that a
             sufficient number of shares of the Fund be automatically sold and
             the proceeds transferred to Morgan Stanley Dean Witter Trust FSB,
             on a semi-monthly, monthly or quarterly basis, for investment in
             shares of the specified fund. Sales of your Fund shares will be
             made on the business day preceding the investment date and Morgan
             Stanley Dean Witter Trust FSB will receive the proceeds for
             investment on the day following the sale date.
            MARGIN ACCOUNTS. If you have pledged your Fund shares in a margin
             account, contact your Morgan Stanley Dean Witter Financial Advisor
             or other authorized financial representative regarding restrictions
             on the sale of such shares.

                                                                              11
<PAGE>
[Sidebar]
TARGETED DIVIDENDS-SM-
YOU MAY SELECT TO HAVE YOUR FUND DISTRIBUTIONS AUTOMATICALLY INVESTED IN ANOTHER
MORGAN STANLEY DEAN WITTER FUND THAT YOU OWN. CONTACT YOUR MORGAN STANLEY DEAN
WITTER FINANCIAL ADVISOR FOR FURTHER INFORMATION ABOUT THIS SERVICE.
[End Sidebar]

[ICON]  DISTRIBUTIONS
- --------------------------------------------------------------------------------
           The Fund passes substantially all of its earnings along to its
           investors as "distributions." The Fund earns interest from
           fixed-income investments. These amounts are passed along to Fund
           shareholders as "income dividend distributions." The Fund may realize
           capital gains whenever it sells securities for a higher price than it
           paid for them. These amounts may be passed along as "capital gain
           distributions;" the Investment Manager does not anticipate that there
           will be significant capital gain distributions.
                            The Fund declares income dividends payable on each
                            day the New York Stock Exchange is open for
                            business. Capital gains, if any, are distributed
                            periodically.
                            Distributions are reinvested automatically in
                            additional shares of the Fund (rounded to the last
                            1/100 of a share) and automatically credited to your
                            account unless you request in writing that
                            distributions be paid in cash. If you elect the cash
                            option, the Fund will reinvest the additional shares
                            and credit your account during the month, then
                            redeem the credited amount no later than the last
                            business day of the month, and mail a check to you
                            no later than seven business days after the end of
                            the month. No interest will accrue on uncashed
           checks. If you wish to change how your distributions are paid, your
           request should be received by the Fund's transfer agent, Morgan
           Stanley Dean Witter Trust FSB, at least five business days prior to
           the record date of the distributions.

[ICON]  TAX CONSEQUENCES
- --------------------------------------------------------------------------------
           As with any investment, you should consider how your Fund investment
           will be taxed. The tax information in this PROSPECTUS is provided as
           general information. You should consult your own tax professional
           about the tax consequences of an investment in the Fund.
           Unless your investment in the Fund is through a tax-deferred
           retirement account, such as a 401(k) plan or IRA, you need to be
           aware of the possible tax consequences when the Fund makes
           distributions.
           Your distributions are normally subject to federal and state income
           tax when they are paid, whether you take them in cash or reinvest
           them in Fund shares. A distribution also may be subject to local
           income tax. Any income dividend distributions and any short-term
           capital gain distributions are taxable to you as ordinary income. Any
           long-term capital gain distributions are taxable as long-term capital
           gains, no matter how long you have owned shares in the Fund.
           Every January, you will be sent a statement (IRS Form 1099-DIV)
           showing the taxable distributions paid to you in the previous year.
           The statement provides information on your dividends and capital
           gains for tax purposes.

 12
<PAGE>
           When you open your Fund account, you should provide your social
           security or tax identification number on your investment application.
           By providing this information, you will avoid being subject to a
           federal backup withholding tax of 31% on taxable distributions and
           sale proceeds. Any withheld amount would be sent to the IRS as an
           advance tax payment.

                                                                              13
<PAGE>
FINANCIAL HIGHLIGHTS

The financial highlights table is intended to help you understand the Fund's
financial performance for the past 5 fiscal years of the Fund. Certain
information reflects financial results for a single Fund share throughout each
year. The total returns in the table represent the rate an investor would have
earned or lost on an investment in the Fund (assuming reinvestment of all
dividends and distributions).

This information has been audited by PricewaterhouseCoopers LLP, independent
accountants, whose report, along with the Fund's financial statements, is
included in this PROSPECTUS.

<TABLE>
<CAPTION>
FOR THE YEAR ENDED JANUARY 31,                                 2000     1999     1998     1997     1996
<S>                                                           <C>      <C>      <C>      <C>      <C>
- ---------------------------------------------------------------------------------------------------------

 SELECTED PER SHARE DATA:
- ---------------------------------------------------------------------------------------------------------
 Net asset value, beginning of period                         $  1.00  $  1.00  $  1.00  $  1.00  $  1.00
                                                              -------  -------  -------  -------  -------
 Net investment income                                          0.044    0.045    0.046    0.043    0.049
 Less dividends from net investment income                     (0.044)  (0.045)  (0.046)  (0.043)  (0.049)
- ---------------------------------------------------------------------------------------------------------
 Net asset value, end of period                               $  1.00  $  1.00  $  1.00  $  1.00  $  1.00
- ---------------------------------------------------------------------------------------------------------

 TOTAL RETURN                                                    4.48%    4.63%    4.67%    4.41%    5.00%
- ---------------------------------------------------------------------------------------------------------

 RATIOS TO AVERAGE NET ASSETS:
- ---------------------------------------------------------------------------------------------------------
 Expenses                                                        0.84%    0.94%    1.02%    1.11%    1.09%
- ---------------------------------------------------------------------------------------------------------
 Net investment income                                           4.34%    4.50%    4.53%    4.29%    4.86%
- ---------------------------------------------------------------------------------------------------------

 SUPPLEMENTAL DATA:
- ---------------------------------------------------------------------------------------------------------
 Net assets, end of period, in millions                        $1,081   $1,017     $891     $927     $903
- ---------------------------------------------------------------------------------------------------------
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
14
<PAGE>
MORGAN STANLEY DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
PORTFOLIO OF INVESTMENTS JANUARY 31, 2000

<TABLE>
<CAPTION>
                                                                                ANNUALIZED
PRINCIPAL                           DESCRIPTION                                    YIELD
AMOUNT IN                               AND                                     ON DATE OF
THOUSANDS                          MATURITY DATE                                 PURCHASE             VALUE
- ----------------------------------------------------------------------------------------------------------------
<C>        <S>                                                             <C>                    <C>
           U.S. GOVERNMENT AGENCIES (98.0%)
$135,212   Federal Farm Credit Bank
             02/08/00-09/12/00...........................................       4.94-6.09%        $  132,996,357
 495,737   Federal Home Loan Banks
             02/01/00-07/05/00...........................................        4.95-5.95           491,120,293
 242,731   Federal Home Loan Mortgage Corp.
             02/03/00-09/01/00...........................................        5.54-6.02           240,988,910
 196,696   Federal National Mortgage Assoc.
             02/02/00-07/20/00...........................................        5.57-5.99           194,041,783
                                                                                                  --------------

           TOTAL U.S. GOVERNMENT AGENCIES
           (AMORTIZED COST $1,059,147,343)......................................................   1,059,147,343
                                                                                                  --------------

           U.S. GOVERNMENT OBLIGATION (0.8%)
   9,000   U.S. Treasury Bill 03/02/00
             (AMORTIZED COST $8,962,950).................................          5.06                8,962,950
                                                                                                  --------------

           REPURCHASE AGREEMENTS (2.1%)
  20,000   Banc of America Securities LLC due 02/01/00 (dated 01/31/00;
             proceeds $20,003,217) (a) (IDENTIFIED COST $20,000,000).....          5.79               20,000,000
   2,115   The Bank of New York due 02/01/00
             (dated 01/31/00; proceeds $2,115,439) (b)
             (IDENTIFIED COST $2,115,101)................................          5.75                2,115,101
                                                                                                  --------------
</TABLE>

<TABLE>
<S>                                                                                       <C>     <C>
TOTAL REPURCHASE AGREEMENTS
(IDENTIFIED COST $22,115,101)...........................................................               22,115,101
                                                                                                  ---------------

TOTAL INVESTMENTS
(IDENTIFIED COST $1,090,225,394) (c)....................................................  100.9%    1,090,225,394

LIABILITIES IN EXCESS OF OTHER ASSETS...................................................   (0.9)       (9,645,622)
                                                                                          -----   ---------------

NET ASSETS..............................................................................  100.0%  $ 1,080,579,772
                                                                                          -----   ---------------
                                                                                          -----   ---------------
</TABLE>

- ---------------------

(a)  Collaterized by $17,175,016 FMAC 5.50% - 10.50% due 6/01/00 - 1/01/30
     valued at $5,462,152 and by $19,434,255 FNMA 0.0% - 9.50% due 3/28/00 -
     12/1/29 valued at $14,937,849.
(b)  Collateralized by $1,981,382 U.S. Treasury Note 5.25% due 05/15/02 valued
     at $1,897,505 and by $251,549 U.S. Treasury Note 7.50% due 05/15/02 valued
     at $259,902.
(c)  Cost is the same for federal income tax purposes.

                       SEE NOTES TO FINANCIAL STATEMENTS

                                                                              15
<PAGE>
MORGAN STANLEY DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
FINANCIAL STATEMENTS

STATEMENT OF ASSETS AND LIABILITIES
JANUARY 31, 2000

<TABLE>
<S>                                                                                           <C>
ASSETS:
Investments in securities, at value
  (identified cost $1,090,225,394)..........................................................  $1,090,225,394
Cash........................................................................................          90,000
Receivable for:
    Shares of beneficial interest sold......................................................         457,217
    Interest................................................................................           3,555
Prepaid expenses and other assets...........................................................         139,559
                                                                                              --------------

     TOTAL ASSETS...........................................................................   1,090,915,725
                                                                                              --------------

LIABILITIES:
Payable for:
    Shares of beneficial interest repurchased...............................................       9,402,725
    Investment management fee...............................................................         405,957
    Plan of distribution fee................................................................          91,721
Accrued expenses and other payables.........................................................         435,550
                                                                                              --------------

     TOTAL LIABILITIES......................................................................      10,335,953
                                                                                              --------------

     NET ASSETS.............................................................................  $1,080,579,772
                                                                                              ==============

COMPOSITION OF NET ASSETS:
Paid-in-capital.............................................................................  $1,080,577,772
Accumulated undistributed net investment income.............................................           2,000
                                                                                              --------------

     NET ASSETS.............................................................................  $1,080,579,772
                                                                                              ==============

NET ASSET VALUE PER SHARE,
  1,080,577,772 SHARES OUTSTANDING (UNLIMITED SHARES AUTHORIZED OF $.01 PAR VALUE)..........           $1.00
                                                                                              ==============
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS

16
<PAGE>
MORGAN STANLEY DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
FINANCIAL STATEMENTS, CONTINUED

STATEMENT OF OPERATIONS
FOR THE YEAR ENDED JANUARY 31, 2000

<TABLE>
<S>                                                                                              <C>
NET INVESTMENT INCOME:

INTEREST INCOME................................................................................  $54,473,807
                                                                                                 -----------

EXPENSES
Investment management fee......................................................................    4,688,933
Transfer agent fees and expenses...............................................................    2,812,787
Plan of distribution fee.......................................................................      795,443
Shareholder reports and notices................................................................      225,030
Registration fees..............................................................................      146,524
Professional fees..............................................................................       71,922
Custodian fees.................................................................................       59,306
Trustees' fees and expenses....................................................................       18,294
Other..........................................................................................       11,284
                                                                                                 -----------

     TOTAL EXPENSES............................................................................    8,829,523
                                                                                                 -----------

     NET INVESTMENT INCOME.....................................................................  $45,644,284
                                                                                                 ===========
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS
                                                                              17
<PAGE>
MORGAN STANLEY DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
FINANCIAL STATEMENTS, CONTINUED

STATEMENT OF CHANGES IN NET ASSETS

<TABLE>
<CAPTION>
                                                                            FOR THE YEAR      FOR THE YEAR
                                                                               ENDED             ENDED
                                                                          JANUARY 31, 2000  JANUARY 31, 1999
- ------------------------------------------------------------------------------------------------------------
<S>                                                                       <C>               <C>
INCREASE (DECREASE) IN NET ASSETS:

OPERATIONS:
Net investment income...................................................   $   45,644,284    $   41,848,979
Net realized gain.......................................................        --                   40,360
                                                                           --------------    --------------

     NET INCREASE.......................................................       45,644,284        41,889,339
                                                                           --------------    --------------

DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS FROM:
Net investment income...................................................      (45,643,923)      (41,849,500)
Net realized gain.......................................................        --                  (40,360)
                                                                           --------------    --------------

     TOTAL DIVIDENDS AND DISTRIBUTIONS..................................      (45,643,923)      (41,889,860)
                                                                           --------------    --------------
Net increase from transactions in shares of beneficial interest.........       63,114,648       126,893,998
                                                                           --------------    --------------

     NET INCREASE.......................................................       63,115,009       126,893,477

NET ASSETS:
Beginning of period.....................................................    1,017,464,763       890,571,286
                                                                           --------------    --------------

     END OF PERIOD
    (INCLUDING UNDISTRIBUTED NET INVESTMENT INCOME OF $2,000 AND $1,639,
    RESPECTIVELY).......................................................   $1,080,579,772    $1,017,464,763
                                                                           ==============    ==============
</TABLE>

                       SEE NOTES TO FINANCIAL STATEMENTS

18
<PAGE>
MORGAN STANLEY DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
NOTES TO FINANCIAL STATEMENTS JANUARY 31, 2000

1. ORGANIZATION AND ACCOUNTING POLICIES

Morgan Stanley Dean Witter U.S. Government Money Market Trust (the "Fund"), is
registered under the Investment Company Act of 1940, as amended (the "Act"), as
a diversified, open-end management investment company. The Fund's investment
objectives are security of principal, high current income and liquidity. The
Fund was organized as a Massachusetts business trust on November 18, 1981 and
commenced operations on February 17, 1982.

The preparation of financial statements in accordance with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts and disclosures. Actual results could differ from
those estimates.

The following is a summary of significant accounting policies:

A. VALUATION OF INVESTMENTS -- Portfolio securities are valued at amortized
cost, which approximates market value.

B. ACCOUNTING FOR INVESTMENTS -- Security transactions are accounted for on the
trade date (date the order to buy or sell is executed). Realized gains and
losses on security transactions are determined by the identified cost method.
Premiums are amortized and discounts are accreted over the life of the
respective securities.

C. FEDERAL INCOME TAX STATUS -- It is the Fund's policy to comply with the
requirements of the Internal Revenue Code applicable to regulated investment
companies and to distribute all of its taxable income to its shareholders.
Accordingly, no federal income tax provision is required.

D. DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS -- The Fund records dividends and
distributions as of the close of each business day.

2. INVESTMENT MANAGEMENT AGREEMENT

Pursuant to an Investment Management Agreement with Morgan Stanley Dean Witter
Advisors Inc. (the "Investment Manager"), the Fund pays the Investment Manager a
management fee, accrued daily and payable monthly, by applying the following
annual rates to the net assets of the Fund determined as of the close of each
business day: 0.50% to the portion of the daily net assets not exceeding $500
million; 0.425% to the portion of the daily net assets exceeding $500 million
but not exceeding $750 million; 0.375% to the portion of the daily net assets
exceeding $750 million but not exceeding $1 billion; 0.35% to the portion of the
daily net assets exceeding $1 billion but not exceeding $1.5 billion; 0.325% to
the portion of the daily net assets exceeding $1.5 billion but not

                                                                              19
<PAGE>
MORGAN STANLEY DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
NOTES TO FINANCIAL STATEMENTS JANUARY 31, 2000, CONTINUED

exceeding $2 billion; 0.30% to the portion of the daily net assets exceeding $2
billion but not exceeding $2.5 billion; 0.275% to the portion of the daily net
assets exceeding $2.5 billion but not exceeding $3 billion; and 0.25% to the
portion of the daily net assets exceeding $3 billion.

Under the terms of the Agreement, the Investment Manager maintains certain of
the Fund's books and records and furnishes, at its own expense, office space,
facilities, equipment, clerical, bookkeeping and certain legal services and pays
the salaries of all personnel, including officers of the Fund who are employees
of the Investment Manager. The Investment Manager also bears the cost of
telephone services, heat, light, power and other utilities provided to the Fund.

3. PLAN OF DISTRIBUTION

Morgan Stanley Dean Witter Distributors Inc. (the "Distributor"), an affiliate
of the Investment Manager, is the distributor of the Fund's shares and, in
accordance with a Plan of Distribution (the "Plan") pursuant to Rule 12b-1 under
the Act, finances certain expenses in connection therewith.

Under the Plan, the Distributor bears the expense of all promotional and
distribution related activities on behalf of the Fund, except for expenses that
the Trustees determine to reimburse, as described below. The following
activities and services may be provided by the Distributor, and other selected
broker-dealers under the Plan: (1) compensation to, and expenses of, Morgan
Stanley Dean Witter Financial Advisors and other selected broker-dealers; (2)
sales incentives and bonuses to sales representatives and to marketing personnel
in connection with promoting sales of the Fund's shares; (3) expenses incurred
in connection with promoting sales of the Fund's shares; (4) preparing and
distributing sales literature; and (5) providing advertising and promotional
activities, including direct mail solicitation and television, radio, newspaper,
magazine and other media advertisements.

The Fund is authorized to reimburse the Distributor for specific expenses the
Distributor incurs or plans to incur in promoting the distribution of the Fund's
shares. The amount of each monthly reimbursement payment may in no event exceed
an amount equal to a payment at the annual rate of 0.15% of the Fund's average
daily net assets during the month. Expenses incurred by the Distributor pursuant
to the Plan in any fiscal year will not be reimbursed by the Fund through
payments accrued in any subsequent fiscal year. For the year ended January 31,
2000, the distribution fee was accrued at the annual rate of 0.08%.

4. SECURITY TRANSACTIONS AND TRANSACTIONS WITH AFFILIATES

The cost of purchases and proceeds from sales/maturities of portfolio securities
for the year ended January 31, 2000 aggregated $12,629,521,746 and
$12,616,296,283, respectively.

20
<PAGE>
MORGAN STANLEY DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
NOTES TO FINANCIAL STATEMENTS JANUARY 31, 2000, CONTINUED

Morgan Stanley Dean Witter Trust FSB, an affiliate of the Investment Manager and
Distributor, is the Fund's transfer agent. At January 31, 2000, the Fund had
transfer agent fees and expenses payable of approximately $244,000.

The Fund has an unfunded noncontributory defined benefit pension plan covering
all independent Trustees of the Fund who will have served as independent
Trustees for at least five years at the time of retirement. Benefits under this
plan are based on years of service and compensation during the last five years
of service. Aggregate pension costs for the year ended January 31, 2000 included
in Trustees' fees and expenses in the Statement of Operations amounted to
$5,918. At January 31, 2000, the Fund had an accrued pension liability of
$51,850 which is included in accrued expenses in the Statement of Assets and
Liabilities.

5. SHARES OF BENEFICIAL INTEREST

Transactions in shares of beneficial interest, at $1.00 per share, were as
follows:

<TABLE>
<CAPTION>
                                                                     FOR THE YEAR       FOR THE YEAR
                                                                         ENDED              ENDED
                                                                   JANUARY 31, 2000   JANUARY 31, 1999
                                                                   -----------------  -----------------
<S>                                                                <C>                <C>
Shares sold......................................................     2,203,424,057      2,239,344,299
Shares issued in reinvestment of dividends.......................        45,490,746         41,717,140
Acquisition of Dean Witter Retirement Series -- U.S. Government
 Money Market Series.............................................         --                   837,211
                                                                   ----------------   ----------------
                                                                      2,248,914,803      2,281,898,650
Shares repurchased...............................................    (2,185,800,155)    (2,155,004,652)
                                                                   ----------------   ----------------
Net increase.....................................................        63,114,648        126,893,998
                                                                   ================   ================
</TABLE>

6. ACQUISITION OF DEAN WITTER RETIREMENT SERIES -- U.S. GOVERNMENT MONEY MARKET
SERIES

As of the close of business on September 11, 1998, the Fund acquired all the net
assets of Dean Witter Retirement Series -- U.S. Government Money Market Series
("Retirement U.S. Government") pursuant to a plan of reorganization approved by
shareholders of Retirement U.S. Government on August 19, 1998. The acquisition
was accomplished by a tax-free exchange of 837,211 shares of the Fund at a net
asset value of $1.00 per share for 837,211 shares of Retirement U.S. Government.
The net assets of the Fund and Retirement U.S. Government immediately before the
acquisition were $942,511,862 and $837,211, respectively. Immediately after the
acquisition, the combined net assets of the Fund amounted to $943,349,073.

                                                                              21
<PAGE>

MORGAN STANLEY DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
REPORT OF INDEPENDENT ACCOUNTANTS

TO THE SHAREHOLDERS AND TRUSTEES
OF MORGAN STANLEY DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST

In our opinion, the accompanying statement of assets and liabilities, including
the portfolio of investments, and the related statements of operations and of
changes in net assets and the financial highlights (appearing in the "Financial
Highlights" table on page 14 of this Prospectus) present fairly, in all material
respects, the financial position of Morgan Stanley Dean Witter U.S. Government
Money Market Trust (the "Fund") at January 31, 2000, the results of its
operations for the year then ended, the changes in its net assets for each of
the two years in the period then ended and the financial highlights for each of
the five years in the period then ended, in conformity with accounting
principles generally accepted in the United States. These financial statements
and financial highlights (hereafter referred to as "financial statements") are
the responsibility of the Fund's management; our responsibility is to express an
opinion on these financial statements based on our audits. We conducted our
audits of these financial statements in accordance with auditing standards
generally accepted in the United States, which require that we plan and perform
the audit to obtain reasonable assurance about whether the financial statements
are free of material misstatement. An audit includes examining, on a test basis,
evidence supporting the amounts and disclosures in the financial statements,
assessing the accounting principles used and significant estimates made by
management, and evaluating the overall financial statement presentation. We
believe that our audits, which included confirmation of securities at
January 31, 2000 by correspondence with the custodian, provide a reasonable
basis for the opinion expressed above.

PricewaterhouseCoopers LLP
1177 AVENUE OF THE AMERICAS
NEW YORK, NEW YORK 10036
MARCH 7, 2000

22
<PAGE>
NOTES

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                                                                              23
<PAGE>
NOTES

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 24
<PAGE>
MORGAN STANLEY DEAN WITTER
FAMILY OF FUNDS

                           The Morgan Stanley Dean Witter Family of Funds offers
                           investors a wide range of investment choices. Come on
                           in and meet the family!
- --------------------------------------------------------------------------------
 GROWTH FUNDS
- ---------------------------------
Aggressive Equity Fund
American Opportunities Fund
Capital Growth Securities
Developing Growth Securities
Growth Fund
Market Leader Trust
Mid-Cap Equity Trust
Next Generation Trust
Small Cap Growth Fund
Special Value Fund

Tax-Managed Growth Fund

21st Century Trend Fund

THEME FUNDS
Financial Services Trust
Health Sciences Trust
Information Fund
Natural Resource Development Securities

GLOBAL/INTERNATIONAL FUNDS
Competitive Edge Fund - "Best Ideas"
 Portfolio
European Growth Fund
Fund of Funds - International Portfolio
International Fund
International SmallCap Fund
Japan Fund
Latin American Growth Fund
Pacific Growth Fund
- --------------------------------------------------------------------------------
 GROWTH AND INCOME FUNDS
- ---------------------------------
Balanced Growth Fund
Balanced Income Fund
Convertible Securities Trust
Dividend Growth Securities
Equity Fund
Fund of Funds - Domestic Portfolio
Income Builder Fund
Mid-Cap Dividend Growth Securities
S&P 500 Index Fund
S&P 500 Select Fund
Strategist Fund
Total Market Index Fund
Total Return Trust
Value Fund
Value-Added Market Series/Equity Portfolio

THEME FUNDS
Real Estate Fund
Utilities Fund

GLOBAL FUNDS
Global Dividend Growth Securities
Global Utilities Fund
- --------------------------------------------------------------------------------
 INCOME FUNDS
- ---------------------------------

GOVERNMENT INCOME FUNDS
Federal Securities Trust
Short-Term U.S. Treasury Trust
U.S. Government Securities Trust

DIVERSIFIED INCOME FUNDS
Diversified Income Trust

CORPORATE INCOME FUNDS
High Yield Securities
Intermediate Income Securities
Short-Term Bond Fund (NL)

GLOBAL INCOME FUNDS
North American Government Income Trust
World Wide Income Trust

TAX-FREE INCOME FUNDS
California Tax-Free Income Fund
Hawaii Municipal Trust (FSC)
Limited Term Municipal Trust (NL)
Multi-State Municipal Series Trust (FSC)
New York Tax-Free Income Fund
Tax-Exempt Securities Trust
- --------------------------------------------------------------------------------
 MONEY MARKET FUNDS
- ---------------------------------

TAXABLE MONEY MARKET FUNDS
Liquid Asset Fund (MM)
U.S. Government Money Market Trust (MM)

TAX-FREE MONEY MARKET FUNDS
California Tax-Free Daily Income Trust (MM)
New York Municipal Money Market Trust (MM)
Tax-Free Daily Income Trust (MM)
There may be Funds created after this PROSPECTUS was published. Please consult
the inside back cover of a new Fund's PROSPECTUS for its designation, e.g.,
Multi-Class Fund or Money Market Fund.
Unless otherwise noted, each listed Morgan Stanley Dean Witter Fund, except for
North American Government Income Trust and Short-Term U.S. Treasury Trust, is a
Multi-Class Fund. A Multi-Class Fund is a mutual fund offering multiple Classes
of shares. The other types of funds are: NL - No-Load (Mutual) Fund; MM - Money
Market Fund; FSC - A mutual fund sold with a front-end sales charge and a
distribution (12b-1) fee.
<PAGE>

                                                             2  3  0 --
                                                            for office use only

                                                             [LOGO]
APPLICATION

MORGAN STANLEY DEAN WITTER U.S. GOVERNMENT MONEY MARKET TRUST
Send to: Morgan Stanley Dean Witter Trust FSB (the "Transfer Agent"), P.O. Box
1040, Jersey City, NJ 07303

[REMOVE APPLICATION CAREFULLY]

<TABLE>
<S>               <C>
INSTRUCTIONS        For assistance in completing this application, telephone Morgan Stanley Dean Witter Trust FSB at (800) 869-NEWS
                    (toll-free).
TO REGISTER
SHARES              1.
(please print)
                  ---------------------------------------------------------------------------------------------------------------
                                  First Name                                    Last Name
- -As joint
  tenants,
  use line          2.
  1 & 2           ---------------------------------------------------------------------------------------------------------------
                                  First Name                                    Last Name
                    (Joint tenants with rights of survivorship unless otherwise
                    specified)
                                                                                              ------------------------
                                                                                              Social Security Number
- -As custodian
  for a minor,      3.
  use lines 1 &
  3
                   ---------------------------------------------------------------------------------------------------------------
                                                                    Minor's Name
                    Under the________Uniform Gifts to Minors Act                            ---------------------------
                                                                                           Minor's Social Security Number
                    State of Residence of Minor
- -In the name of a
  corporation,      4.
  trust,
  partnership
  or other         ---------------------------------------------------------------------------------------------------------------
  institutional                       Name of Corporation, Trust (including trustee name(s)) or Other Organization
  investors, use
  line 4
                    If Trust, Date of Trust Instrument:____________                          Tax Identification
                                                                                             Number__________
ADDRESS
                   ---------------------------------------------------------------------------------------------------------------
                      City                       State                       Zip Code

TO PURCHASE
SHARES:
Minimum Initial     / / CHECK (enclosed) $__________ (Make Payable to Morgan Stanley Dean Witter U.S. Government Money Market
Investment:         Trust)
$1,000              / / WIRE*  On__________          MF*________
                                   (Date)               (Control number, this transaction)

                   ----------------------------------------------------------------------------------------------------------
                    Name of Bank                                                                        Branch
                   ----------------------------------------------------------------------------------------------------------
                    Address
                   ----------------------------------------------------------------------------------------------------------
                    Telephone Number
                    * For an initial investment made by wiring funds, obtain a control number by calling: (800) 869-NEWS
                    (toll-free).
                    Your bank should wire to:
                    Bank of New York for credit to account of Morgan Stanley Dean Witter Trust FSB

                    Account Number: 8900188413
                    Re: Morgan Stanley Dean Witter U.S. Government Money Market Trust
                    Account Of:______________________
                    (Investor's Account as Registered at the Transfer Agent)
                    Control or Account Number:______________________
                    (Assigned by Telephone)
                                                         OPTIONAL SERVICES

                    NOTE: If you are a current shareholder of Morgan Stanley Dean Witter
                    U.S. Government Money Market Trust, please indicate your fund
                    account number here.
                    [ 2 ] [ 3 ] [ 0 ]  -
                                         ------------------------------------------------

DIVIDENDS           All dividends will be reinvested daily in additional shares, unless the following option is selected:
                    / / Pay income dividends by check at the end of each month.
WRITE YOUR OWN      / / Send an initial supply of checks.
CHECK               FOR JOINT ACCOUNTS:
                    / / CHECK THIS BOX IF ALL OWNERS ARE REQUIRED TO SIGN CHECKS.
</TABLE>

<PAGE>

<TABLE>
<S>               <C>
                  / /  Morgan Stanley Dean Witter Trust FSB is hereby authorized to honor telephonic or other instructions, without
PAYMENT TO           signature guarantee, from any person for the redemption of any or all shares of Morgan Stanley Dean Witter U.S.
PREDESIGNATED          Government Money Market Trust held in my (our) account provided that proceeds are transmitted only to the
BANK ACCOUNT           following bank account. (Absent its own negligence, neither Morgan Stanley Dean Witter U.S. Government Money
                       Market Trust nor Morgan Stanley Dean Witter Trust FSB (the "Transfer Agent") shall be liable for any
                       redemption caused by unauthorized instruction(s)):
Bank Account
must be in
same name as
shares are
registered        -------------------------------------------------------------------------------  ------------------------------
                  NAME & BANK ACCOUNT NUMBER                                                        BANK'S ROUTING TRANSMIT CODE
                                                                                                          (ASK YOUR BANK)
Minimum Amount:   -------------------------------------------------------------------------------
$1,000            NAME OF BANK

                  -------------------------------------------------------------------------------
                  ADDRESS OF BANK
                  (       )
                  -------------------------------------------------------------------------------
                  TELEPHONE NUMBER OF BANK
                                                              SIGNATURE AUTHORIZATION
FOR ALL ACCOUNTS  NOTE: RETAIN A COPY OF THIS DOCUMENT FOR YOUR RECORDS. ANY MODIFICATION OF THE INFORMATION BELOW WILL REQUIRE AN
                  AMENDMENT TO THIS FORM. THIS DOCUMENT IS IN FULL FORCE AND EFFECT UNTIL ANOTHER DULY EXECUTED FORM IS RECEIVED BY
                  THE TRANSFER AGENT.
                  The "Transfer Agent" is hereby authorized to act as agent for the registered owner of shares of Morgan Stanley
                  Dean Witter U.S. Government Money Market Trust (the "Fund") in effecting redemptions of shares and is authorized
                  to recognize the signature(s) below in payment of funds resulting from such redemptions on behalf of the
                  registered owners of such shares. The Transfer Agent shall be liable only for its own negligence and not for
                  default or negligence of its correspondents, or for losses in transit. The Fund shall not be liable for any
                  default or negligence of the Transfer Agent.
                  I (we) certify to my (our) legal capacity, or the capacity of the investor named above, to invest in and redeem
                  shares of, and I (we) acknowledge receipt of a current prospectus of, Morgan Stanley Dean Witter U.S. Government
                  Money Market Trust and (we) further certify my (our) authority to sign and act for and on behalf of the investor.
                  Under penalties of perjury, I certify (1) that the number shown on this form is my correct taxpayer identification
                  number and (2) that I am not subject to backup withholding either because I have not been notified that I am
                  subject to backup withholding as a result of a failure to report all interest or dividends, or the Internal
                  Revenue Service has notified me that I am no longer subject to backup withholding. (Note: You must cross out item
                  (2) above if you have been notified by IRS that you are currently subject to backup withholding because of
                  underreporting interest or dividends on your tax return.)
                  For Individual, Joint and Custodial Accounts for Minors, Check Applicable Box:
                  / / I am a United States Citizen.                     / / I am not a United States Citizen.
                                                  SIGNATURE(S) (IF JOINT TENANTS, ALL MUST SIGN)
</TABLE>

<TABLE>
<S>               <C>                                                       <C>
                  ------------------------------------------------          ------------------------------------------------
                          SIGNATURE MUST BE KEPT WITHIN ABOVE AREA                  SIGNATURE MUST BE KEPT WITHIN ABOVE AREA

                  --------------------------------------------------------  --------------------------------------------------------
                          SIGNATURE MUST BE KEPT WITHIN ABOVE AREA                  SIGNATURE MUST BE KEPT WITHIN ABOVE AREA
Name(s) must be
signed
exactly the same  SIGNED THIS_______________DAY OF__________, 20____.
as shown on
lines 1 to 4 on
the reverse
side of this                                FOR CORPORATIONS, TRUSTS, PARTNERSHIPS AND OTHER ORGANIZATIONS
application
                  The following named persons are currently officers/trustees/general partners/other authorized signatories of the
                  Registered Owner, and any_____* of them ("Authorized Person(s)") is/are currently authorized under the applicable
                  governing document to act with full power to sell, assign or transfer securities of the the Fund for the
                  Registered Owner and to execute and deliver any instrument necessary to effectuate the authority hereby conferred:
                                         NAME/TITLE                                                SIGNATURE
</TABLE>

<TABLE>
<S>               <C>                                                       <C>
In addition,
complete
Section A or B    --------------------------------------------------------  --------------------------------------------------------
below.
                  --------------------------------------------------------  --------------------------------------------------------
                          SIGNATURE MUST BE KEPT WITHIN ABOVE AREA                  SIGNATURE MUST BE KEPT WITHIN ABOVE AREA

                  --------------------------------------------------------  --------------------------------------------------------
                          SIGNATURE MUST BE KEPT WITHIN ABOVE AREA                  SIGNATURE MUST BE KEPT WITHIN ABOVE AREA

                  --------------------------------------------------------  --------------------------------------------------------
                          SIGNATURE MUST BE KEPT WITHIN ABOVE AREA                  SIGNATURE MUST BE KEPT WITHIN ABOVE AREA
                  SIGNED THIS____________DAY OF____________, 20____.
                  The Transfer Agent may, without inquiry, act only upon the instruction of ANY PERSON(S) purporting to be (an)
                  Authorized Person(s) as named in the Certification Form last received by the Transfer Agent. The Transfer Agent
                  and the Fund shall not be liable for any claims, expenses (including legal fees) or losses resulting from the
                  Transfer Agent having acted upon any instruction reasonably believed genuine.
                  ------------------------------------------------------------------------------------------------------------------
                  *INSERT A NUMBER. UNLESS OTHERWISE INDICATED, THE TRANSFER AGENT MAY HONOR INSTRUCTIONS OF ANY ONE OF THE PERSONS
                   NAMED ABOVE.
</TABLE>

<TABLE>
<S>                   <C>
SECTION (A)           NOTE: EITHER A SIGNATURE GUARANTEE OR CORPORATE SEAL IS REQUIRED.
CORPORATIONS AND
INCORPORATED
ASSOCIATIONS ONLY.    I, ____________, Secretary of the Registered Owner, do hereby certify that at a meeting on
SIGN ABOVE AND COM-   ____________ at which a quorum was present throughout, the Board of Directors of the
PLETE THIS            corporation/the officers of the association duly adopted a resolution, which is in full force and
SECTION               effect and in accordance with the Registered Owner's charter and by-laws, which resolution did the
                      following: (1) empowered the above-named Authorized Person(s) to effect securities transactions
                      for the Registered Owner on the terms described above; (2) authorized the Secretary to certify,
                      from time to time, the names and titles of the officers of the Registered Owner and to notify the
                      Transfer Agent when changes in office occur; and (3) authorized the Secretary to certify that such
                      a resolution has been duly adopted and will remain in full force and effect until the Transfer
                      Agent receives a duly executed amendment to the Certification Form.
SIGNATURE
GUARANTEE**           Witness my hand on behalf of the corporation/association this ______ day of ____________, 20____.
(or Corporate Seal)
                      --------------------------------------------------------------------------------------------------
                                                                 Secretary**
                      The undersigned officer (other than the Secretary) hereby certifies that the foregoing instrument
                      has been signed by the Secretary of the
                      corporation/association.
SIGNATURE
GUARANTEE**           --------------------------------------------------------------------------------------------------
(or Corporate Seal)                  Certifying Officer of the Corporation or Incorporated Association**

SECTION (B) ALL                                    NOTE: A SIGNATURE GUARANTEE IS REQUIRED.
OTHER
INSTITUTIONAL         --------------------------------------------------------------------------------------------------
INVESTORS                                                         Certifying
SIGNATURE                                          Trustee(s)/General Partner(s)/Other(s)**
GUARANTEE**
                      --------------------------------------------------------------------------------------------------
SIGN ABOVE AND COM-                                               Certifying
PLETE THIS SECTION                                 Trustee(s)/General Partner(s)/Other(s)**
                      --------------------------------------------------------------------------------------------------
                      **SIGNATURE(S) MUST BE GUARANTEED BY AN ELIBIGLE GUARANTOR
</TABLE>

<TABLE>
<S>               <C>
DEALER            Above signature(s) guaranteed. Prospectus has been delivered by undersigned to above-named applicant(s).
(if any)
Completion by
dealer only       ----------------------------------------------------  ----------------------------------------------------
                  Firm Name                                             Office Number-Account Number at Dealer-A/E Number
                  ----------------------------------------------------  ----------------------------------------------------
                  Address                                               Account Executive's Last Name
                  ----------------------------------------------------  ----------------------------------------------------
                  City, State, Zip Code                                 Branch Office
</TABLE>

- -Registered Trademark- 2000 Morgan Stanley Dean Witter Distributors Inc.
<PAGE>
                                                     PROSPECTUS - MARCH 20, 2000
Additional information about the Fund's investments is available in the Fund's
ANNUAL AND SEMI-ANNUAL REPORTS TO SHAREHOLDERS (the current annual report is
included in this PROSPECTUS). The Fund's STATEMENT OF ADDITIONAL INFORMATION
also provides additional information about the Fund. The STATEMENT OF ADDITIONAL
INFORMATION is incorporated herein by reference (legally is part of this
PROSPECTUS). For a free copy of any of these documents, to request other
information about the Fund, or to make shareholder inquiries, please call:
                                 (800) 869-NEWS
You also may obtain information about the Fund by calling your Morgan Stanley
Dean Witter Financial Advisor or by visiting our Internet site at:
                         www.msdw.com/individual/funds
Information about the Fund (including the STATEMENT OF ADDITIONAL INFORMATION)
can be viewed and copied at the Securities and Exchange Commission's Public
Reference Room in Washington, DC. Information about the Reference Room's
operations may be obtained by calling the SEC at (202) 942-8090. Reports and
other information about the Fund are available on the EDGAR Database on the
SEC's Internet site (www.sec.gov) and copies of this information may be
obtained, after paying a duplicating fee, by electronic request at the following
e-mail address: [email protected], or by writing the Public Reference Section
of the SEC, Washington, DC 20549-0102.

 TICKER SYMBOL: DWGXX

(THE FUND'S INVESTMENT COMPANY ACT FILE NO. IS 811-3326)
Morgan Stanley Dean Witter
                                                                 U.S. GOVERNMENT
                                                              MONEY MARKET TRUST

                               [BACK COVER PHOTO]

                                                        A MONEY MARKET FUND THAT
                                                       SEEKS TO PROVIDE SECURITY
                                                      OF PRINCIPAL, HIGH CURRENT
                                                            INCOME AND LIQUIDITY
<PAGE>

<TABLE>
<S>                                           <C>
STATEMENT OF ADDITIONAL INFORMATION           MORGAN STANLEY
MARCH 20, 2000                                DEAN WITTER
                                              U.S. GOVERNMENT
                                              MONEY MARKET
                                              TRUST
</TABLE>

- --------------------------------------------------------------------------------

    This STATEMENT OF ADDITIONAL INFORMATION is not a PROSPECTUS. The PROSPECTUS
(dated March 20, 2000) for the Morgan Stanley Dean Witter U.S. Government Money
Market Trust may be obtained without charge from the Fund at its address or
telephone number listed below or from Dean Witter Reynolds at any of its branch
offices.

Morgan Stanley Dean Witter
U.S. Government Money Market Trust
Two World Trade Center
New York, New York 10048
(800) 869-NEWS
<PAGE>
TABLE OF CONTENTS
- --------------------------------------------------------------------------------

<TABLE>
<S>                                                           <C>
I. Fund History.............................................    4

II. Description of the Fund and Its Investments and Risks...    4

  A. Classification.........................................    4

  B. Investment Strategies and Risks........................    4

  C. Fund Policies/Investment Restrictions..................    6

III. Management of the Fund.................................    7

  A. Board of Trustees......................................    7

  B. Management Information.................................    7

  C. Compensation...........................................   12

IV. Control Persons and Principal Holders of Securities.....   14

V. Investment Management and Other Services.................   14

  A. Investment Manager.....................................   14

  B. Principal Underwriter..................................   15

  C. Services Provided by the Investment Manager............   15

  D. Rule 12b-1 Plan........................................   16

  E. Other Service Providers................................   18

  F.  Codes of Ethics.......................................   18

VI. Brokerage Allocation and Other Practices................   18

  A. Brokerage Transactions.................................   18

  B. Commissions............................................   19

  C. Brokerage Selection....................................   19

  D. Directed Brokerage.....................................   20

  E. Regular Broker-Dealers.................................   20

VII. Capital Stock and Other Securities.....................   20

VIII. Purchase, Redemption and Pricing of Shares............   21

  A. Purchase/Redemption of Shares..........................   21

  B. Offering Price.........................................   21

IX. Taxation of the Fund and Shareholders...................   23

X. Underwriters.............................................   24

XI. Calculation of Performance Data.........................   24

XII. Financial Statements...................................   25
</TABLE>

                                       2
<PAGE>
GLOSSARY OF SELECTED DEFINED TERMS
- --------------------------------------------------------------------------------

    The terms defined in this glossary are frequently used in this STATEMENT OF
ADDITIONAL INFORMATION (other terms used occasionally are defined in the text of
the document).

"CUSTODIAN"--The Bank of New York.

"DEAN WITTER REYNOLDS"--Dean Witter Reynolds Inc., a wholly-owned broker-dealer
subsidiary of MSDW.

"DISTRIBUTOR"--Morgan Stanley Dean Witter Distributors Inc., a wholly-owned
broker-dealer subsidiary of MSDW.

"FINANCIAL ADVISORS"--Morgan Stanley Dean Witter authorized financial services
representatives.

"FUND"--Morgan Stanley Dean Witter U.S. Government Money Market Trust, a
registered open-end investment company.

"INVESTMENT MANAGER"--Morgan Stanley Dean Witter Advisors Inc., a wholly-owned
investment advisor subsidiary of MSDW.

"INDEPENDENT TRUSTEES"--Trustees who are not "interested persons" (as defined by
the Investment Company Act) of the Fund.

"MORGAN STANLEY & CO."--Morgan Stanley & Co. Incorporated, a wholly-owned
broker-dealer subsidiary of MSDW.

"MORGAN STANLEY DEAN WITTER FUNDS"--Registered investment companies (i) for
which the Investment Manager serves as the investment advisor and (ii) that hold
themselves out to investors as related companies for investment and investor
services.

"MSDW"--Morgan Stanley Dean Witter & Co., a preeminent global financial services
firm.

"MSDW SERVICES COMPANY"--Morgan Stanley Dean Witter Services Company Inc., a
wholly-owned fund services subsidiary of the Investment Manager.

"TRANSFER AGENT"--Morgan Stanley Dean Witter Trust FSB, a wholly-owned transfer
agent subsidiary of MSDW.

"TRUSTEES"--The Board of Trustees of the Fund.

                                       3
<PAGE>
I. FUND HISTORY
- --------------------------------------------------------------------------------

    The Fund was organized as a Massachusetts business trust, under a
Declaration of Trust, on November 18, 1981, with the name Sears U.S. Government
Money Market Trust. On March 21, 1983, the Fund's name was changed to Dean
Witter/Sears U.S. Government Money Market Trust. On February 19, 1993, the
Fund's name was changed to Dean Witter U.S. Government Money Market Trust.
Effective June 22, 1998, the Fund's name was changed to Morgan Stanley Dean
Witter U.S. Government Money Market Trust.

II. DESCRIPTION OF THE FUND AND ITS INVESTMENTS AND RISKS
- --------------------------------------------------------------------------------

A. CLASSIFICATION

    The Fund is an open-end, diversified management investment company whose
investment objectives are security of principal, high current income and
liquidity.

B. INVESTMENT STRATEGIES AND RISKS

    The following discussion of the Fund's investment strategies and risks
should be read with the sections of the Fund's PROSPECTUS titled "Principal
Investment Strategies" and "Principal Risks."

    REPURCHASE AGREEMENTS.  The Fund may invest in repurchase agreements. When
cash may be available for only a few days, it may be invested by the Fund in
repurchase agreements until such time as it may otherwise be invested or used
for payments of obligations of the Fund. These agreements, which may be viewed
as a type of secured lending by the Fund, typically involve the acquisition by
the Fund of debt securities from a selling financial institution such as a bank,
savings and loan association or broker-dealer. The agreement provides that the
Fund will sell back to the institution, and that the institution will
repurchase, the underlying security serving as collateral at a specified price
and at a fixed time in the future, usually not more than seven days from the
date of purchase. The Fund will accrue interest from the institution until the
time when the repurchase is to occur. Although this date is deemed by the Fund
to be the maturity date of a repurchase agreement, the maturities of securities
subject to repurchase agreements are not subject to any limits.

    While repurchase agreements involve certain risks not associated with direct
investments in debt securities, the Fund follows procedures designed to minimize
such risks. These procedures include effecting repurchase transactions only with
large, well-capitalized and well-established financial institutions, whose
financial condition will be continuously monitored. In addition, the value of
the collateral underlying the repurchase agreement will always be at least equal
to the resale price which consists of the acquisition price paid to the seller
of the securities plus the accrued resale premium which is defined as the amount
specified in the repurchase agreement or the daily amortization of the
difference between the acquisition price and the resale price specified in the
repurchase agreement. Such collateral will consist entirely of securities that
are direct obligations of, or that are fully guaranteed as to principal and
interest by, the United States or any agency thereof, and/or certificates of
deposit, bankers' acceptances which are eligible for acceptance by a Federal
Reserve Bank, and, if the seller is a bank, mortgage related securities (as such
term is defined in section 3(a)(41) of the Securities Exchange Act of 1934 that,
at the time the repurchase agreement is entered into, are rated in the highest
rating category by the Requisite NRSROs (as defined under Rule 2a-7 of the
Investment Company Act of 1940). Additionally, Upon an Event of Insolvency (as
defined under Rule 2a-7) with respect to the seller, the collateral must qualify
the repurchase agreement for preferential treatment under a provision of
applicable insolvency law providing an exclusion from any automatic stay of
creditors' rights against the seller. In the event of a default or bankruptcy by
a selling financial institution, the Fund will seek to liquidate such
collateral. However, the exercising of the Fund's right to liquidate such
collateral could involve certain costs or delays and, to the extent that
proceeds from any sale upon a default of the obligation to repurchase were less
than the repurchase price, the Fund could suffer a loss. It is the current
policy of the Fund not to invest in repurchase agreements that do not mature
within seven days if any such investment, together with any other illiquid
assets held by the Fund, amount to more than 10% of its total assets. The Fund's
investments in repurchase agreements may at times be substantial when, in the
view of the Fund's investment manager, liquidity or other considerations
warrant.

                                       4
<PAGE>
    REVERSE REPURCHASE AGREEMENTS.  The Fund may also use reverse repurchase
agreements as part of its investment strategy. Reverse repurchase agreements
involve sales by the Fund of portfolio assets concurrently with an agreement by
the Fund to repurchase the same assets at a later date at a fixed price.
Generally, the effect of such a transaction is that the Fund can recover all or
most of the cash invested in the portfolio securities involved during the term
of the reverse repurchase agreement, while it will be able to keep the interest
income associated with those portfolio securities. Such transactions are only
advantageous if the interest cost to the Fund of the reverse repurchase
transaction is less than the cost of obtaining the cash otherwise. Opportunities
to achieve this advantage may not always be available, and the Fund intends to
use the reverse repurchase technique only when it will be to its advantage to do
so. The Fund will establish a segregated account with its custodian bank in
which it will maintain cash or cash equivalents or other portfolio securities
equal in value to its obligations in respect of reverse repurchase agreements.
Reverse repurchase agreements are considered borrowings by the Fund and for
purposes other than meeting redemptions may not exceed 5% of the Fund's total
assets.

    LENDING PORTFOLIO SECURITIES.  The Fund may lend its portfolio securities to
brokers, dealers and other financial institutions, provided that the loans are
callable at any time by the Fund, and are at all times secured by cash or cash
equivalents, which are maintained in a segregated account pursuant to applicable
regulations and that are equal to at least 100% of the market value, determined
daily, of the loaned securities. The advantage of these loans is that the Fund
continues to receive the income on the loaned securities while at the same time
earning interest on the cash amounts deposited as collateral, which will be
invested in short-term obligations. The Fund will not lend its portfolio
securities if such loans are not permitted by the laws or regulations of any
state in which its shares are qualified for sale and will not lend more than 10%
of the value of its total assets.

    As with any extensions of credit, there are risks of delay in recovery and,
in some cases, even loss of rights in the collateral should the borrower of the
securities fail financially. However, these loans of portfolio securities will
only be made to firms deemed by the Fund's management to be creditworthy and
when the income which can be earned from such loans justifies the attendant
risks. Upon termination of the loan, the borrower is required to return the
securities to the Fund. Any gain or loss in the market price during the loan
period would inure to the Fund.

    When voting or consent rights which accompany loaned securities pass to the
borrower, the Fund will follow the policy of calling the loaned securities, to
be delivered within one day after notice, to permit the exercise of the rights
if the matters involved would have a material effect on the Fund's investment in
the loaned securities. The Fund will pay reasonable finder's, administrative and
custodial fees in connection with a loan of its securities.

    WHEN-ISSUED AND DELAYED DELIVERY SECURITIES.  From time to time the Fund may
purchase securities on a when-issued or delayed delivery basis. When these
transactions are negotiated, the price is fixed at the time of the commitment,
but delivery and payment can take place a month or more after the date of
commitment. While the Fund will only purchase securities on a when-issued,
delayed delivery with the intention of acquiring the securities, the Fund may
sell the securities before the settlement date, if it is deemed advisable. The
securities so purchased or sold are subject to market fluctuation and no
interest or dividends accrue to the purchaser prior to the settlement date.

    At the time the Fund makes the commitment to purchase or sell securities on
a when-issued, delayed delivery, it will record the transaction and thereafter
reflect the value, each day, of such security purchased, or if a sale, the
proceeds to be received, in determining its net asset value. At the time of
delivery of the securities, their value may be more or less than the purchase or
sale price. An increase in the percentage of the Fund's assets committed to the
purchase of securities on a when-issued, delayed delivery may increase the
volatility of its net asset value. The Fund will also establish a segregated
account on the Fund's books in which it will continually maintain cash or cash
equivalents or other liquid portfolio securities equal in value to commitments
to purchase securities on a when-issued or delayed delivery basis.

    YEAR 2000.  The investment management services provided to the Fund by the
Investment Manager and the services provided to shareholders by the Distributor
and the Transfer Agent depend on the smooth functioning of their computer
systems. Many computer software systems in use today were

                                       5
<PAGE>
designed in such a way that they may not be able to recognize the year 2000, but
revert to 1900 or some other date, due to the manner in which dates were encoded
and calculated. That failure could have a negative impact on the handling of
securities trades, pricing and account services.

    Improperly functioning trading systems may result in settlement problems and
liquidity issues. Corporate and governmental data processing errors could result
in production problems for individual issuers and overall economic
uncertainties. Operations ran smoothly from the last week in December through
the first few weeks of January, but the year 2000 issue may yet have an adverse
impact on financial market participants and other entities, including the
issuers whose securities are contained in the Fund's portfolio.

C. FUND POLICIES/INVESTMENT RESTRICTIONS

    The investment objectives, policies and restrictions listed below have been
adopted by the Fund as fundamental policies. Under the Investment Company Act of
1940 (the "Investment Company Act"), a fundamental policy may not be changed
without the vote of a majority of the outstanding voting securities of the Fund.
The Investment Company Act defines a majority as the lesser of (a) 67% or more
of the shares present at a meeting of shareholders, if the holders of 50% of the
outstanding shares of the Fund are present or represented by proxy; or (b) more
than 50% of the outstanding shares of the Fund. For purposes of the following
restrictions: (i) all percentage limitations apply immediately after a purchase
or initial investment; and (ii) any subsequent change in any applicable
percentage resulting from market fluctuations or other changes in total or net
assets does not require elimination of any security from the portfolio.

    The Fund will:

         1.  Seek to provide security of principal, high current income and
    liquidity.

    The Fund may not:

         1.  Purchase common stocks, preferred stocks, warrants, other equity
    securities, corporate bonds, municipal bonds or industrial revenue bonds.

         2.  Borrow money, except from banks for temporary or emergency
    purposes, including the meeting of redemption requests which might otherwise
    require the untimely disposition of securities; or through its transactions
    in reverse repurchase agreements. Borrowing in the aggregate, including
    reverse repurchase agreements, may not exceed 20%, and borrowing for
    purposes other than meeting redemptions may not exceed 5% of the value of
    the Fund's total assets (including the amount borrowed), less liabilities
    (not including the amount borrowed) at the time the borrowing is made.
    Borrowings in excess of 5% will be repaid before additional investments are
    made.

         3.  Pledge, hypothecate, mortgage or otherwise encumber its assets,
    except in an amount up to 10% of the value of its net assets, but only to
    secure borrowings for temporary or emergency purposes.

         4.  Sell securities short or purchase securities on margin.

         5.  Write or purchase put or call options.

         6.  Underwrite the securities of other issuers or purchase restricted
    securities except insofar as the Fund may enter into any repurchase or
    reverse repurchase agreements.

                                       6
<PAGE>
         7.  Purchase or sell real estate, real estate investment trust
    securities, commodities or commodity contracts or oil and gas interests.

         8.  Make loans to others, except: (a) by the purchase of qualified debt
    obligations; (b) lending portfolio securities; and (c) by investment in
    repurchase agreements referred to above and in the Prospectus.

         9.  Issue senior securities as defined in the Act except insofar as the
    Fund may be deemed to have issued a senior security by reason of: (a)
    entering into any repurchase or reverse repurchase agreement; (b) borrowing
    money in accordance with restrictions described above; or (c) lending
    portfolio securities.

        10.  Purchase securities of other investment companies, except in
    connection with a merger, consolidation, reorganization or acquisition of
    assets.

        11.  Lend its portfolio securities in excess of 10% of its total assets.
    Any loans of portfolio securities will be made according to guidelines
    established by the Trustees, including maintenance of cash collateral of the
    borrower equal at all times to the current market value of the securities
    loaned.

    Notwithstanding any other investment policy or restriction, the Fund may
seek to achieve its investment objective by investing all or substantially all
of its assets in another investment company having substantially the same
investment objective and policies as the Fund.

III. MANAGEMENT OF THE FUND
- --------------------------------------------------------------------------------

A. BOARD OF TRUSTEES

    The Board of Trustees of the Fund oversees the management of the Fund but
does not itself manage the Fund. The Trustees review various services provided
by or under the direction of the Investment Manager to ensure that the Fund's
general investment policies and programs are properly carried out. The Trustees
also conduct their review to ensure that administrative services are provided to
the Fund in a satisfactory manner.

    Under state law, the duties of the Trustees are generally characterized as a
duty of loyalty and a duty of care. The duty of loyalty requires a Trustee to
exercise his or her powers in the interest of the Fund and not the Trustee's own
interest or the interest of another person or organization. A Trustee satisfies
his or her duty of care by acting in good faith with the care of an ordinarily
prudent person and in a manner the Trustee reasonably believes to be in the best
interest of the Fund and its shareholders.

B. MANAGEMENT INFORMATION

    TRUSTEES AND OFFICERS.  The Board of the Fund consists of eight (8)
Trustees. These same individuals also serve as directors or trustees for all of
the Morgan Stanley Dean Witter Funds. Six Trustees (75% of the total number)
have no affiliation or business connection with the Investment Manager or any of
its affiliated persons and do not own any stock or other securities issued by
the Investment Manager's parent company, MSDW. These are the "non-interested" or
"independent" Trustees. The other two Trustees (the "management Trustees") are
affiliated with the Investment Manager.

                                       7
<PAGE>
    The Trustees and executive officers of the Fund, their principal business
occupations during the last five years and their affiliations, if any, with the
Investment Manager, and with the Morgan Stanley Dean Witter Funds (there were 93
such funds as of the calendar year ended December 31, 1999), are shown below.

<TABLE>
<CAPTION>
  NAME, AGE, POSITION WITH FUND AND ADDRESS     PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ---------------------------------------------  -----------------------------------------------
<S>                                            <C>
Michael Bozic (59) ..........................  Vice Chairman of Kmart Corporation (since
Trustee                                        December 1998); Director or Trustee of the
c/o Kmart Corporation                          Morgan Stanley Dean Witter Funds; formerly
3100 West Big Beaver Road                      Chairman and Chief Executive Officer of Levitz
Troy, Michigan                                 Furniture Corporation (November 1995-November
                                               1998) and President and Chief Executive Officer
                                               of Hills Department Stores (May 1991-July
                                               1995); formerly variously Chairman, Chief
                                               Executive Officer, President and Chief
                                               Operating Officer (1987-1991) of the Sears
                                               Merchandise Group of Sears, Roebuck and Co.;
                                               Director of Weirton Steel Corporation.

Charles A. Fiumefreddo* (66) ................  Chairman, Director or Trustee and Chief
Chairman of the Board,                         Executive Officer of the Morgan Stanley Dean
Chief Executive Officer and Trustee            Witter Funds; formerly Chairman, Chief
Two World Trade Center                         Executive Officer and Director of the
New York, New York                             Investment Manager, the Distributor and MSDW
                                               Services Company; Executive Vice President and
                                               Director of Dean Witter Reynolds; Chairman and
                                               Director of the Transfer Agent; formerly
                                               Director and/or officer of various MSDW
                                               subsidiaries (until June 1998).

Edwin J. Garn (67) ..........................  Director or Trustee of the Morgan Stanley Dean
Trustee                                        Witter Funds; formerly United States
c/o Huntsman Corporation                       Senator (R-Utah) (1974-1992) and Chairman,
500 Huntsman Way                               Senate Banking Committee (1980-1986); formerly
Salt Lake City, Utah                           Mayor of Salt Lake City, Utah (1971-1974);
                                               formerly Astronaut, Space Shuttle Discovery
                                               (April 12-19, 1985); Vice Chairman, Huntsman
                                               Corporation (chemical company); Director of
                                               Franklin Covey (time management systems), BMW
                                               Bank of North America, Inc. (industrial loan
                                               corporation), United Space Alliance (joint
                                               venture between Lockheed Martin and the Boeing
                                               Company) and Nuskin Asia Pacific (multilevel
                                               marketing); member of the board of various
                                               civic and charitable organizations.

Wayne E. Hedien (66) ........................  Retired; Director or Trustee of the Morgan
Trustee                                        Stanley Dean Witter Funds; Director of The PMI
c/o Mayer, Brown & Platt                       Group, Inc. (private mortgage insurance);
Counsel to the Independent Trustees            Trustee and Vice Chairman of The Field Museum
1675 Broadway                                  of Natural History; formerly associated with
New York, New York                             the Allstate Companies (1966-1994), most
                                               recently as Chairman of The Allstate
                                               Corporation (March 1993-December 1994) and
                                               Chairman and Chief Executive Officer of its
                                               wholly-owned subsidiary, Allstate Insurance
                                               Company (July 1989-December 1994); director of
                                               various other business and charitable
                                               organizations.
</TABLE>

                                       8
<PAGE>

<TABLE>
<CAPTION>
  NAME, AGE, POSITION WITH FUND AND ADDRESS     PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ---------------------------------------------  -----------------------------------------------
<S>                                            <C>
Dr. Manuel H. Johnson (51) ..................  Senior Partner, Johnson Smick International,
Trustee                                        Inc., a consulting firm; Co-Chairman and a
c/o Johnson Smick International, Inc.          founder of the Group of Seven Council (G7C), an
1133 Connecticut Avenue, N.W.                  international economic commission; Chairman of
Washington, D.C.                               the Audit Committee and Director or Trustee of
                                               the Morgan Stanley Dean Witter Funds; Director
                                               of Greenwich Capital Markets, Inc.
                                               (broker-dealer) and NVR, Inc. (home
                                               construction); Chairman and Trustee of the
                                               Financial Accounting Foundation (oversight
                                               organization of the Financial Accounting
                                               Standards Board); formerly Vice Chairman of the
                                               Board of Governors of the Federal Reserve
                                               System (1986-1990) and Assistant Secretary of
                                               the U.S. Treasury.

Michael E. Nugent (63) ......................  General Partner, Triumph Capital, L.P., a
Trustee                                        private investment partnership; Chairman of the
c/o Triumph Capital, L.P.                      Insurance Committee and Director or Trustee of
237 Park Avenue                                the Morgan Stanley Dean Witter Funds; formerly
New York, New York                             Vice President, Bankers Trust Company and BT
                                               Capital Corporation (1984-1988); director of
                                               various business organizations.

Philip J. Purcell* (56) .....................  Chairman of the Board of Directors and Chief
Trustee                                        Executive Officer of MSDW, Dean Witter Reynolds
1585 Broadway                                  and Novus Credit Services Inc.; Director of the
New York, New York                             Distributor; Director or Trustee of the Morgan
                                               Stanley Dean Witter Funds; Director of American
                                               Airlines, Inc. and its parent company, AMR
                                               Corporation; Director and/ or officer of
                                               various MSDW subsidiaries.

John L. Schroeder (69) ......................  Retired; Chairman of the Derivatives Committee
Trustee                                        and Director or Trustee of the Morgan Stanley
c/o Mayer Brown & Platt                        Dean Witter Funds; Director of Citizens
Counsel to the Independent Trustees            Utilities Company (telecommunications, gas,
1675 Broadway                                  electric and water utilities company); formerly
New York, New York                             Executive Vice President and Chief Investment
                                               Officer of the Home Insurance Company (August
                                               1991-September 1995).
</TABLE>

                                       9
<PAGE>

<TABLE>
<CAPTION>
  NAME, AGE, POSITION WITH FUND AND ADDRESS     PRINCIPAL OCCUPATIONS DURING LAST FIVE YEARS
- ---------------------------------------------  -----------------------------------------------
<S>                                            <C>
Mitchell M. Merin (46) ......................  President and Chief Operating Officer of Asset
President                                      Management of MSDW (since December 1998);
Two World Trade Center                         President and Director (since April 1997) and
New York, New York                             Chief Executive Officer (since June 1998) of
                                               the Investment Manager and MSDW Services
                                               Company; Chairman, Chief Executive Officer and
                                               Director of the Distributor (since June 1998);
                                               Chairman and Chief Executive Officer (since
                                               June 1998) and Director (since January 1998) of
                                               the Transfer Agent; Director of various MSDW
                                               subsidiaries; President of the Morgan Stanley
                                               Dean Witter Funds (since May 1999); Trustee of
                                               various Van Kampen investment companies (since
                                               December 1999); previously Chief Strategic
                                               Officer of the Investment Manager and MSDW
                                               Services Company and Executive Vice President
                                               of the Distributor (April 1997-June 1998), Vice
                                               President of the Morgan Stanley Dean Witter
                                               Funds (May 1997-April 1999), and Executive Vice
                                               President of Dean Witter, Discover & Co.

Barry Fink (45) .............................  Executive Vice President (since December 1999)
Vice President, Secretary and General Counsel  and Secretary and General Counsel (since
Two World Trade Center                         February 1997) and Director (since July 1998)
New York, New York                             of the Investment Manager and MSDW Services
                                               Company; Executive Vice President (since
                                               December 1999) and Assistant Secretary and
                                               Assistant General Counsel (since February 1997)
                                               of the Distributor; Assistant Secretary of Dean
                                               Witter Reynolds (since August 1996); Vice
                                               President, Secretary and General Counsel of the
                                               Morgan Stanley Dean Witter Funds (since
                                               February 1997); previously First Vice President
                                               (June 1993-February 1997), Vice President and
                                               Assistant Secretary and Assistant General
                                               Counsel of the Investment Manager and MSDW Ser-
                                               vices Company, Senior Vice President of the
                                               Distributor (March 1997-December 1999) and
                                               Assistant Secretary of the Morgan Stanley Dean
                                               Witter Funds.

Jonathan R. Page (53) .......................  Senior Vice President of the Investment Manager
Vice President                                 and Director of the Money Market Group of the
Two World Trade Center                         Investment Manager; Vice President of various
New York, New York                             Morgan Stanley Dean Witter Funds.

Thomas F. Caloia (53) .......................  First Vice President and Assistant Treasurer of
Treasurer                                      the Investment Manager and MSDW Services Com-
Two World Trade Center                         pany; Treasurer of the Morgan Stanley Dean
New York, New York                             Witter Funds.
</TABLE>

- ------------------------
*Denotes Trustees who are "interested persons" of the Fund as defined by the
Investment Company Act.

                                       10
<PAGE>
    In addition, RONALD E. ROBISON, Executive Vice President, Chief
Administrative Officer and Director of the Investment Manager and MSDW Services
Company, ROBERT S. GIAMBRONE, Senior Vice President of the Investment Manager,
MSDW Services Company, the Distributor and the Transfer Agent and Director of
the Transfer Agent, JOSEPH J. MCALINDEN, Executive Vice President and Chief
Investment Officer of the Investment Manager and Director of the Transfer Agent,
PETER M. AVELAR, Director of the High Yield Group and Senior Vice President of
the Investment Manager, PAUL D. VANCE, Director of the Growth and Income Group
and Senior Vice President of the Investment Manager, and JAMES F. WILLISON,
Director of the Tax-Exempt Fixed Income Group and Senior Vice President of the
Investment Manager, are Vice Presidents of the Fund.

    In addition, MARILYN K. CRANNEY, TODD LEBO, LOU ANNE D. MCINNIS, CARSTEN
OTTO and RUTH ROSSI, First Vice Presidents and Assistant General Counsels of the
Investment Manager and MSDW Services Company, and NATASHA KASSIAN, Assistant
Vice President and Assistant General Counsel of the Investment Manager and MSDW
Services Company, are Assistant Secretaries of the Fund.

    INDEPENDENT DIRECTORS/TRUSTEES AND THE COMMITTEES.  Law and regulation
establish both general guidelines and specific duties for the independent
directors/trustees. The Morgan Stanley Dean Witter Funds seek as independent
directors/trustees individuals of distinction and experience in business and
finance, government service or academia; these are people whose advice and
counsel are in demand by others and for whom there is often competition. To
accept a position on the Funds' boards, such individuals may reject other
attractive assignments because the Funds make substantial demands on their time.
All of the Independent Trustees serve as members of the Audit Committee. In
addition, three of the directors/trustees, including two independent
directors/trustees, serve as members of the Derivatives Committee and the
Insurance Committee.

    The independent directors/trustees are charged with recommending to the full
board approval of management, advisory and administration contracts, Rule 12b-1
plans and distribution and underwriting agreements; continually reviewing Fund
performance; checking on the pricing of portfolio securities, brokerage
commissions, transfer agent costs and performance, and trading among Funds in
the same complex; and approving fidelity bond and related insurance coverage and
allocations, as well as other matters that arise from time to time. The
independent directors/trustees are required to select and nominate individuals
to fill any independent director/trustee vacancy on the board of any Fund that
has a Rule 12b-1 plan of distribution. Most of the Morgan Stanley Dean Witter
Funds have a Rule 12b-1 plan.

    The Audit Committee is charged with recommending to the full board the
engagement or discharge of the Fund's independent accountants; directing
investigations into matters within the scope of the independent accountants'
duties, including the power to retain outside specialists; reviewing with the
independent accountants the audit plan and results of the auditing engagement;
approving professional services provided by the independent accountants and
other accounting firms prior to the performance of the services; reviewing the
independence of the independent accountants; considering the range of audit and
non-audit fees; reviewing the adequacy of the Fund's system of internal
controls; and preparing and submitting Committee meeting minutes to the full
board.

    The board of each Fund has a Derivatives Committee to approve parameters for
and monitor the activities of the Fund with respect to derivative investments,
if any, made by the Fund.

    Finally, the board of each Fund has formed an Insurance Committee to review
and monitor the insurance coverage maintained by the Fund.

    ADVANTAGES OF HAVING SAME INDIVIDUALS AS INDEPENDENT DIRECTORS/TRUSTEES FOR
ALL MORGAN STANLEY DEAN WITTER FUNDS.  The independent directors/trustees and
the Funds' management believe that having the same independent
directors/trustees for each of the Morgan Stanley Dean Witter Funds avoids the
duplication of effort that would arise from having different groups of
individuals serving as independent directors/trustees for each of the Funds or
even of sub-groups of Funds. They believe that having the same individuals serve
as independent directors/trustees of all the Funds tends to increase their
knowledge and expertise regarding matters which affect the Fund complex
generally and enhances

                                       11
<PAGE>
their ability to negotiate on behalf of each Fund with the Fund's service
providers. This arrangement also precludes the possibility of separate groups of
independent directors/trustees arriving at conflicting decisions regarding
operations and management of the Funds and avoids the cost and confusion that
would likely ensue. Finally, having the same independent directors/trustees
serve on all Fund boards enhances the ability of each Fund to obtain, at modest
cost to each separate Fund, the services of independent directors/trustees, of
the caliber, experience and business acumen of the individuals who serve as
independent directors/trustees of the Morgan Stanley Dean Witter Funds.

    TRUSTEE AND OFFICER INDEMNIFICATION.  The Fund's Declaration of Trust
provides that no Trustee, officer, employee or agent of the Fund is liable to
the Fund or to a shareholder, nor is any Trustee, officer, employee or agent
liable to any third persons in connection with the affairs of the Fund, except
as such liability may arise from his/her or its own bad faith, willful
misfeasance, gross negligence or reckless disregard of his/her or its duties. It
also provides that all third persons shall look solely to the Fund property for
satisfaction of claims arising in connection with the affairs of the Fund. With
the exceptions stated, the Declaration of Trust provides that a Trustee,
officer, employee or agent is entitled to be indemnified against all liability
in connection with the affairs of the Fund.

C. COMPENSATION

    The Fund pays each Independent Trustee an annual fee of $800 plus a per
meeting fee of $50 for meetings of the Board of Trustees, the Independent
Trustees or Committees of the Board of Trustees attended by the Trustee (the
Fund pays the Chairman of the Audit Committee an additional annual fee of $750
and the Chairmen of the Derivatives and Insurance Committees additional annual
fees of $500). If a Board meeting and a meeting of the Independent Trustees or a
Committee meeting, or a meeting of the Independent Trustees and/or more than one
Committee meeting, take place on a single day, the Trustees are paid a single
meeting fee by the Fund. The Fund also reimburses such Trustees for travel and
other out-of-pocket expenses incurred by them in connection with attending such
meetings. Trustees and officers of the Fund who are or have been employed by the
Investment Manager or an affiliated company receive no compensation or expense
reimbursement from the Fund for their services as Trustee.

    The following table illustrates the compensation that the Fund paid to its
Independent Trustees for the fiscal year ended January 31, 2000.

                               FUND COMPENSATION

<TABLE>
<CAPTION>
                                                               AGGREGATE
                                                             COMPENSATION
NAME OF INDEPENDENT TRUSTEE                                  FROM THE FUND
- ---------------------------                                  -------------
<S>                                                          <C>
Michael Bozic...............................................    $1,550
Edwin J. Garn...............................................     1,600
Wayne E. Hedien.............................................     1,600
Dr. Manuel H. Johnson.......................................     2,288
Michael E. Nugent...........................................     2,058
John L. Schroeder...........................................     2,058
</TABLE>

                                       12
<PAGE>
    The following table illustrates the compensation paid to the Fund's
Independent Trustees for the calendar year ended December 31, 1999 for services
to the 93 Morgan Stanley Dean Witter Funds that were in operation at December
31, 1999.

            CASH COMPENSATION FROM MORGAN STANLEY DEAN WITTER FUNDS

<TABLE>
<CAPTION>
                                                                TOTAL CASH
                                                               COMPENSATION
                                                              FOR SERVICES TO
                                                                 93 MORGAN
                                                                  STANLEY
                                                                DEAN WITTER
NAME OF INDEPENDENT TRUSTEE                                        FUNDS
- ---------------------------                                   ---------------
<S>                                                           <C>
Michael Bozic...............................................     $134,600
Edwin J. Garn...............................................      138,700
Wayne E. Hedien.............................................      138,700
Dr. Manuel H. Johnson.......................................      208,638
Michael E. Nugent...........................................      193,324
John L. Schroeder...........................................      193,324
</TABLE>

    As of the date of this STATEMENT OF ADDITIONAL INFORMATION, 55 of the Morgan
Stanley Dean Witter Funds, including the Fund, have adopted a retirement program
under which an independent director/ trustee who retires after serving for at
least five years (or such lesser period as may be determined by the Board) as an
independent director/trustee of any Morgan Stanley Dean Witter Fund that has
adopted the retirement program (each such Fund referred to as an "Adopting Fund"
and each such director/trustee referred to as an "Eligible Trustee") is entitled
to retirement payments upon reaching the eligible retirement age (normally,
after attaining age 72). Annual payments are based upon length of service.

    Currently, upon retirement, each Eligible Trustee is entitled to receive
from the Adopting Fund, commencing as of his or her retirement date and
continuing for the remainder of his or her life, an annual retirement benefit
(the "Regular Benefit") equal to 30.22% of his or her Eligible Compensation plus
0.5036667% of such Eligible Compensation for each full month of service as an
independent director/ trustee of any Adopting Fund in excess of five years up to
a maximum of 60.44% after ten years of service. The foregoing percentages may be
changed by the Board.(1) "Eligible Compensation" is one-fifth of the total
compensation earned by such Eligible Trustee for service to the Adopting Fund in
the five year period prior to the date of the Eligible Trustee's retirement.
Benefits under the retirement program are accrued as expenses on the books of
the Adopting Funds. Such benefits are not secured or funded by the Adopting
Funds.

    The following table illustrates the retirement benefits accrued to the
Fund's Independent Trustees by the Fund for the fiscal year ended January 31,
2000 and by the 55 Morgan Stanley Dean Witter Funds (including the Fund) for the
year ended December 31, 1999, and the estimated retirement benefits for the
Independent Trustees, to commence upon their retirement, from the Fund as of
January 31, 2000 and from the 55 Morgan Stanley Dean Witter Funds as of December
31, 1999.

- ------------------------
(1)  An Eligible Trustee may elect alternative payments of his or her retirement
     benefits based upon the combined life expectancy of the Eligible Trustee
     and his or her spouse on the date of such Eligible Trustee's retirement. In
     addition, the Eligible Trustee may elect that the surviving spouse's
     periodic payment of benefits will be equal to a lower percentage of the
     periodic amount when both spouses were alive. The amount estimated to be
     payable under this method, through the remainder of the later of the lives
     of the Eligible Trustee and spouse, will be the actuarial equivalent of the
     Regular Benefit.

                                       13
<PAGE>
   RETIREMENT BENEFITS FROM THE FUND AND ALL MORGAN STANLEY DEAN WITTER FUNDS

<TABLE>
<CAPTION>
                                FOR ALL ADOPTING FUNDS
                             -----------------------------                             ESTIMATED ANNUAL
                               ESTIMATED                      RETIREMENT BENEFITS          BENEFITS
                               CREDITED                       ACCRUED AS EXPENSES     UPON RETIREMENT(2)
                                 YEARS         ESTIMATED     ---------------------   --------------------
                             OF SERVICE AT   PERCENTAGE OF                BY ALL       FROM     FROM ALL
                              RETIREMENT       ELIGIBLE       BY THE     ADOPTING      THE      ADOPTING
NAME OF INDEPENDENT TRUSTEE  (MAXIMUM 10)    COMPENSATION      FUND       FUNDS        FUND       FUNDS
- ---------------------------  -------------   -------------   --------   ----------   --------   ---------
<S>                          <C>             <C>             <C>        <C>          <C>        <C>
Michael Bozic.............         10           60.44%         $377     $20,933      $   907    $ 50,588
Edwin J. Garn.............         10           60.44           553      31,737          909      50,675
Wayne E. Hedien...........          9           51.37           709      39,566          771      43,000
Dr. Manuel H. Johnson.....         10           60.44           241      13,129        1,360      75,520
Michael E. Nugent.........         10           60.44           415      23,175        1,209      67,209
John L. Schroeder.........          8           50.37           805      41,558          955      52,994
</TABLE>

- ------------------------
(2)  Based on current levels of compensation. Amount of annual benefits also
     varies depending on the Trustee's elections described in Footnote (1) on
     page 13.

IV. CONTROL PERSONS AND PRINCIPAL HOLDERS OF SECURITIES
- --------------------------------------------------------------------------------

    The following owned 5% or more of the outstanding shares of the Fund on
March 3, 2000: Mellon Bank N.A., Mutual Funds, P.O. Box 3198, Pittsburgh PA
15230, as trustee of the Morgan Stanley Dean Witter START Plan, an employee
benefit plan established under Sections 401(a) and 401(k) of the Internal
Revenue Code for the benefit of certain employees of MSDW and its subsidiaries
- -- 13.15%.

    As of the date of this STATEMENT OF ADDITIONAL INFORMATION, the aggregate
number of shares of beneficial interest of the Fund owned by the Fund's officers
and Trustees as a group was less than 1% of the Fund's shares of beneficial
interest outstanding.

V. INVESTMENT MANAGEMENT AND OTHER SERVICES
- --------------------------------------------------------------------------------

A. INVESTMENT MANAGER

    The Investment Manager to the Fund is Morgan Stanley Dean Witter Advisors
Inc., a Delaware corporation, whose address is Two World Trade Center, New York,
NY 10048. The Investment Manager is a wholly-owned subsidiary of MSDW, a
Delaware corporation. MSDW is a preeminent global financial services firm that
maintains leading market positions in each of its three primary businesses:
securities, asset management and credit services.

    Pursuant to an Investment Management Agreement (the "Management Agreement")
with the Investment Manager, the Fund has retained the Investment Manager to
provide administrative services and manage the investment of the Fund's assets,
including the placing of orders for the purchase and sale of portfolio
securities. The Fund pays the Investment Manager monthly compensation calculated
daily by applying the following annual rates to the net assets of the Fund,
determined as of the close of business on every business day: 0.50% of the
portion of the daily net assets not exceeding $500 million; 0.425% of the
portion of the daily net assets exceeding $500 million but not exceeding $750
million; 0.375% of the portion of the daily net assets exceeding $750 million
but not exceeding $1 billion; 0.35% of the portion of the daily net assets
exceeding $1 billion but not exceeding $1.5 billion; 0.325% of the portion of
the daily net assets exceeding $1.5 billion but not exceeding $2 billion; 0.30%
of the portion of the daily net assets exceeding $2 billion but not exceeding
$2.5 billion; 0.275% of the portion of the daily net assets exceeding $2.5
billion but not exceeding $3 billion; and 0.25% of the portion of the daily net
assets exceeding $3 billion.

    For the fiscal years ended January 31, 1998, 1999 and 2000, the Investment
Manager accrued total compensation under the Management Agreement in the amounts
of $4,108,339, $4,236,205 and $4,688,933, respectively.

                                       14
<PAGE>
    The Investment Manager has retained its wholly-owned subsidiary, MSDW
Services Company, to perform administrative services for the Fund.

B. PRINCIPAL UNDERWRITER

    The Fund's principal underwriter is the Distributor (which has the same
address as the Investment Manager). In this capacity, the Fund's shares are
distributed by the Distributor. The Distributor has entered into a selected
dealer agreement with Dean Witter Reynolds, which through its own sales
organization sells shares of the Fund. In addition, the Distributor may enter
into similar agreements with other selected broker-dealers. The Distributor, a
Delaware corporation, is a wholly-owned subsidiary of MSDW.

    The Fund and the Distributor have agreed to indemnify each other against
certain liabilities, including liabilities under the Securities Act. Under the
Distribution Agreement, the Distributor uses its best efforts in rendering
services to the Fund, but in the absence of willful misfeasance, bad faith,
gross negligence or reckless disregard of its obligations, the Distributor is
not liable to the Fund or any of its shareholders for any error of judgment or
mistake of law or for any act or omission or for any losses sustained by the
Fund or its shareholders.

C. SERVICES PROVIDED BY THE INVESTMENT MANAGER

    The Investment Manager manages the investment of the Fund's assets,
including the placing of orders for the purchase and sale of portfolio
securities. The Investment Manager obtains and evaluates the information and
advice relating to the economy, securities markets, and specific securities as
it considers necessary or useful to continuously manage the assets of the Fund
in a manner consistent with its investment objective.

    Under the terms of the Management Agreement, in addition to managing the
Fund's investments, the Investment Manager maintains certain of the Fund's books
and records and furnishes, at its own expense, the office space, facilities,
equipment, clerical help, bookkeeping and certain legal services as the Fund may
reasonably require in the conduct of its business, including the preparation of
prospectuses, proxy statements and reports required to be filed with federal and
state securities commissions (except insofar as the participation or assistance
of independent accountants and attorneys is, in the opinion of the Investment
Manager, necessary or desirable). In addition, the Investment Manager pays the
salaries of all personnel, including officers of the Fund, who are employees of
the Investment Manager. The Investment Manager also bears the cost of telephone
service, heat, light, power and other utilities provided to the Fund.

    Expenses not expressly assumed by the Investment Manager under the
Management Agreement or by the Distributor, will be paid by the Fund. These
expenses include, but are not limited to: expenses of the Plan of Distribution
pursuant to Rule 12b-1; charges and expenses of any registrar, custodian, stock
transfer and dividend disbursing agent; brokerage commissions; taxes; engraving
and printing share certificates; registration costs of the Fund and its shares
under federal and state securities laws; the cost and expense of printing,
including typesetting, and distributing prospectuses of the Fund and supplements
thereto to the Fund's shareholders; all expenses of shareholders' and Trustees'
meetings and of preparing, printing and mailing of proxy statements and reports
to shareholders; fees and travel expenses of Trustees or members of any advisory
board or committee who are not employees of the Investment Manager or any
corporate affiliate of the Investment Manager; all expenses incident to any
dividend, withdrawal or redemption options; charges and expenses of any outside
service used for pricing of the Fund's shares; fees and expenses of legal
counsel, including counsel to the Trustees who are not interested persons of the
Fund or of the Investment Manager (not including compensation or expenses of
attorneys who are employees of the Investment Manager); fees and expenses of the
Fund's independent accountants; membership dues of industry associations;
interest on Fund borrowings; postage; insurance premiums on property or
personnel (including officers and Trustees) of the Fund which inure to its
benefit; extraordinary expenses (including, but not limited to, legal claims and
liabilities and litigation costs and any indemnification relating thereto); and
all other costs of the Fund's operation.

                                       15
<PAGE>
    The Management Agreement provides that in the absence of willful
misfeasance, bad faith, gross negligence or reckless disregard of its
obligations thereunder, the Investment Manager is not liable to the Fund or any
of its investors for any act or omission by the Investment Manager or for any
losses sustained by the Fund or its investors.

    The Management Agreement will remain in effect from year to year, provided
continuance of the Management Agreement is approved at least annually by the
vote of the holders of a majority, as defined in the Investment Company Act, of
the outstanding shares of the Fund, or by the Trustees; provided that in either
event such continuance is approved annually by the vote of a majority of the
Trustees, including a majority of the Independent Trustees.

D. RULE 12b-1 PLAN

    In accordance with a Plan of Distribution pursuant to Rule 12b-1 under the
Investment Company Act between the Fund and the Distributor, the Distributor
provides certain services in connection with the promotion of sales of Fund
shares (the "Plan").

    The Plan provides that the Distributor bears the expense of all promotional
and distribution related activities on behalf of the Fund, except for expenses
that the Trustees determine to reimburse, as described below. The following
activities and services may be provided by the Distributor under the Plan: (1)
compensation to and expenses of Dean Witter Reynolds' and other selected
Broker-Dealers' Financial Advisors and other employees, including overhead and
telephone expenses; (2) sales incentives and bonuses to sales representatives
and to marketing personnel in connection with promoting sales of the Fund's
shares; (3) expenses incurred in connection with promoting sales of the Fund's
shares; (4) preparing and distributing sales literature; and (5) providing
advertising and promotional activities, including direct mail solicitation and
television, radio, newspaper, magazine and other media advertisements.

    The Investment Manager will compensate Financial Advisors at an annual rate
of 0.025% of the value of shares of the Fund acquired by exchange from an MSDW
Open-end Fund provided that the shares exchanged would otherwise have been
eligible for the payment of a retention fee. Such eligible shares must have been
purchased after January 1, 2000 and held for at least one year. Shares owned in
variable annuities, closed-end fund shares held in 401(k) plans where the
Transfer Agent or Dean Witter Reynolds' Retirement Plan Services is either
recordkeeper or trustee are not eligible for a retention fee.

    The retention fees are paid by the Investment Manager from its own assets,
which may include profits from investment management fees payable under the
Management Agreement, as well as from borrowed funds.

    Dean Witter Reynolds' Financial Advisors are paid an annual residual
commission, currently a residual of up to 0.10% of the current value of the
respective accounts for which they are the Financial Advisors of record. The
residual is a charge which reflects residual commissions paid by Dean Witter
Reynolds to its Financial Advisors and Dean Witter Reynolds' expenses associated
with the servicing of shareholders' accounts, including the expenses of
operating Dean Witter Reynolds' branch offices in connection with the servicing
of shareholders' accounts, which expenses include lease costs, the salaries and
employee benefits of operations and sales support personnel, utility costs,
communications costs and the costs of stationery and supplies and other expenses
relating to branch office serving of shareholder accounts.

    The Fund is authorized to reimburse specific expenses incurred or to be
incurred in promoting the distribution of the Fund's shares. Reimbursement is
made through payments at the end of each month. The amount of each monthly
payment may in no event exceed an amount equal to a payment at the annual rate
of 0.15 of 1% of the Fund's average daily net assets during the month. No
interest or other financing charges will be incurred for which reimbursement
payments under the Plan will be made. In addition, no interest charges, if any,
incurred on any distribution expense incurred by the Distributor or other
selected dealers pursuant to the Plan, will be reimbursable under the Plan. In
the case of all expenses other than expenses representing a residual to
Financial Advisors, such amounts shall be

                                       16
<PAGE>
determined at the beginning of each calendar quarter by the Trustees, including
a majority of the Independent 12b-1 Trustees. Expenses representing a residual
to Financial Advisors may be reimbursed without prior determination. In the
event that the Distributor proposes that monies shall be reimbursed for other
than such expenses, then in making quarterly determinations of the amounts that
may be expended by the Fund, the Investment Manager provides and the Trustees
review a quarterly budget of projected incremental distribution expenses to be
incurred on behalf of the Fund, together with a report explaining the purposes
and anticipated benefits of incurring such expenses. The Trustees determine
which particular expenses, and the portions thereof, that may be borne by the
Fund, and in making such a determination shall consider the scope of the
Distributor's commitment to promoting the distribution of the Fund's shares.

    The Fund reimbursed $795,443 to the Distributor pursuant to the Plan which
amounted to .08% of the Fund's average daily net assets for the fiscal year
ended January 31, 2000. Based upon the total amounts spent by the Distributor
during the period, it is estimated that the amount paid by the Fund to the
Distributor for distribution was spent in approximately the following ways: (i)
advertising -- $-0-; (ii) printing and mailing PROSPECTUSES to other than
current shareholders -- $-0-; (iii) compensation to underwriters -- $-0-; (iv)
compensation to dealers --$-0-; (v) compensation to sales personnel -- $-0-; and
(vi) other, which includes payments to Dean Witter Reynolds for expenses
substantially all of which relate to compensation of sales personnel and
associated overhead expenses -- $795,443. No payments under the Plan were made
for interest, carrying or other financing charges.

    Under the Plan, the Distributor uses its best efforts in rendering services
to the Fund, but in the absence of willful misfeasance, bad faith, gross
negligence or reckless disregard of its obligations, the Distributor is not
liable to the Fund or any of its shareholders for any error of judgment or
mistake of law or for any act or omission or for any losses sustained by the
Fund or its shareholders.

    Under the Plan, the Distributor provides the Fund, for review by the
Trustees, and the Trustees review, promptly after the end of each calendar
quarter, a written report regarding the incremental distribution expenses
incurred on behalf of the Fund during such calendar quarter, which report
includes (1) an itemization of the types of expenses and the purposes therefore;
(2) the amounts of such expenses; and (3) a description of the benefits derived
by the Fund. In the Trustees' quarterly review of the Plan they consider its
continued appropriateness and the level of compensation provided therein.

    No interested person of the Fund nor any Independent Trustee has any direct
financial interest in the operation of the Plan except to the extent that the
Distributor, the Investment Manager, Dean Witter Reynolds, MSDW Services Company
or certain of their employees may be deemed to have such an interest as a result
of benefits derived from the successful operation of the Plan or as a result of
receiving a portion of the amounts expended thereunder by the Fund.

    On an annual basis, the Trustees, including a majority of the Independent
Trustees, consider whether the Plan should be continued. Prior to approving the
most recent continuation of the Plan, the Trustees requested and received from
the Distributor and reviewed all the information which they deemed necessary to
arrive at an informed determination. In making their determination to continue
the Plan, the Trustees considered: (1) the Fund's experience under the Plan and
whether such experience indicates that the Plan is operating as anticipated;
(2) the benefits the Fund had obtained, was obtaining and would be likely to
obtain under the Plan, including that: (a) the Plan is essential in order to
implement the Fund's method of distribution and to enable the Fund to continue
to grow and avoid a pattern of net redemptions which, in turn, are essential for
effective investment management; and (b) without the reimbursement of
distribution and account maintenance expenses of Dean Witter Reynolds' branch
offices made possible by the 12b-1 fees, Dean Witter Reynolds could not
establish and maintain an effective system for distribution, servicing of Fund
shareholders and maintenance of shareholder accounts; and (3) what services had
been provided and were continuing to be provided under the Plan to the Fund and
its shareholders. Based upon their review, the Trustees, including each of the
Independent Trustees, determined that continuation of the Plan would be in the
best interest of the Fund and would have a reasonable likelihood of continuing
to benefit the Fund and its shareholders. In the Trustees' quarterly review of
the Plan, they will consider its continued appropriateness and the level of
compensation provided therein.

                                       17
<PAGE>
    The Plan may not be amended to increase materially the amount to be spent
for the services described therein without approval by the shareholders of the
Fund, and all material amendments to the Plan must also be approved by the
Trustees in the manner described above. The Plan may be terminated at any time,
without payment of any penalty, by vote of a majority of the Independent
Trustees or by a vote of a majority of the outstanding voting securities of the
Fund (as defined in the Investment Company Act) on not more than thirty days'
written notice to any other party to the Plan. So long as the Plan is in effect,
the election and nomination of Independent Trustees shall be committed to the
discretion of the Independent Trustees.

E. OTHER SERVICE PROVIDERS

(1) TRANSFER AGENT/DIVIDEND-PAYING AGENT

    Morgan Stanley Dean Witter Trust FSB is the transfer agent for the Fund's
shares and the Dividend Disbursing Agent for payment of dividends and
distributions on Fund shares and Agent for shareholders under various investment
plans. The principal business address of the Transfer Agent is Harborside
Financial Center, Plaza Two, Jersey City, NJ 07311.

(2) CUSTODIAN AND INDEPENDENT ACCOUNTANTS

    The Bank of New York, 100 Church Street, New York, NY 10007 is the Custodian
for the Fund's assets. Any of the Fund's cash balances with the Custodian in
excess of $100,000 are unprotected by federal deposit insurance. These balances
may, at times, be substantial.

    PricewaterhouseCoopers LLP, 1177 Avenue of the Americas, New York, NY 10036
serves as the independent accountants of the Fund. The independent accountants
are responsible for auditing the annual financial statements of the Fund.

(3) AFFILIATED PERSONS

    The Transfer Agent is an affiliate of the Investment Manager, and of the
Distributor. As Transfer Agent and Dividend Disbursing Agent, the Transfer
Agent's responsibilities include maintaining shareholder accounts, disbursing
cash dividends and reinvesting dividends, processing account registration
changes, handling purchase and redemption transactions, mailing prospectuses and
reports, mailing and tabulating proxies, processing share certificate
transactions, and maintaining shareholder records and lists. For these services,
the Transfer Agent receives a per shareholder account fee from the Fund and is
reimbursed for its out-of-pocket expenses in connection with such services.

F. CODES OF ETHICS

    The Fund, the Investment Manager and the Distributor have each adopted a
Code of Ethics pursuant to Rule 17j-1 under the Investment Company Act. The
Codes of Ethics are designed to detect and prevent improper personal trading.
The Codes of Ethics permit personnel subject to the Codes to invest in
securities, including securities that may be purchased, sold or held by the
Fund, subject to a number of restrictions and controls including prohibitions
against purchases of securities in an Initial Public Offering and a preclearance
requirement with respect to personal securities transactions.

VI. BROKERAGE ALLOCATION AND OTHER PRACTICES
- --------------------------------------------------------------------------------

A. BROKERAGE TRANSACTIONS

    Subject to the general supervision of the Trustees, the Investment Manager
is responsible for decisions to buy and sell securities for the Fund, the
selection of brokers and dealers to effect the transactions, and the negotiation
of brokerage commissions, if any. Purchases and sales of portfolio securities
are normally transacted through issuers, underwriters or major dealers in U.S.
Government securities acting as principals. Such transactions are made on a net
basis and do not involve payment of brokerage commissions. The cost of
securities purchased from an underwriter usually includes a commission paid by
the issuer to the underwriters; transactions with dealers normally reflect the
spread between bid and asked prices.

    During the fiscal years ended January 31, 1998, 1999 and 2000, the Fund paid
no such brokerage commissions or concessions.

                                       18
<PAGE>
B. COMMISSIONS

    Pursuant to an order of the SEC, the Fund may effect principal transactions
in certain money market instruments with Dean Witter Reynolds. The Fund will
limit its transactions with Dean Witter Reynolds to U.S. Government and
Government Agency Securities. The transactions will be effected with Dean Witter
Reynolds only when the price available from Dean Witter Reynolds is better than
that available from other dealers.

    During the fiscal years ended January 31, 1998, 1999 and 2000, the Fund did
not effect any principal transactions with Dean Witter Reynolds.

    Brokerage transactions in securities listed on exchanges or admitted to
unlisted trading privileges may be effected through Dean Witter Reynolds, Morgan
Stanley & Co. and other affiliated brokers and dealers. In order for an
affiliated broker or dealer to effect any portfolio transactions on an exchange
for the Fund, the commissions, fees or other remuneration received by the
affiliated broker or dealer must be reasonable and fair compared to the
commissions, fees or other remuneration paid to other brokers in connection with
comparable transactions involving similar securities being purchased or sold on
an exchange during a comparable period of time. This standard would allow the
affiliated broker or dealer to receive no more than the remuneration which would
be expected to be received by an unaffiliated broker in a commensurate
arm's-length transaction. Furthermore, the Trustees, including the Independent
Trustees, have adopted procedures which are reasonably designed to provide that
any commissions, fees or other remuneration paid to an affiliated broker or
dealer are consistent with the foregoing standard. The Fund does not reduce the
management fee it pays to the Investment Manager by any amount of the brokerage
commissions it may pay to an affiliated broker or dealer.

    During the fiscal years ended January 31, 1998, 1999 and 2000, the Fund paid
no brokerage commissions to an affiliated broker or dealer.

C. BROKERAGE SELECTION

    The policy of the Fund regarding purchases and sales of securities for its
portfolio is that primary consideration will be given to obtaining the most
favorable prices and efficient executions of transactions.

    In seeking to implement the Fund's policies, the Investment Manager effects
transactions with those brokers and dealers who the Investment Manager believes
provide the most favorable prices and are capable of providing efficient
executions. If the Investment Manager believes the prices and executions are
obtainable from more than one broker or dealer, it may give consideration to
placing portfolio transactions with those brokers and dealers who also furnish
research and other services to the Fund or the Investment Manager. The services
may include, but are not limited to, any one or more of the following:
information as to the availability of securities for purchase or sale;
statistical or factual information or opinions pertaining to investment; wire
services; and appraisals or evaluations of portfolio securities.

    The information and services received by the Investment Manager from brokers
and dealers may be of benefit to the Investment Manager in the management of
accounts of some of its other clients and may not in all cases benefit the Fund
directly. While the receipt of such information and services is useful in
varying degrees and would generally reduce the amount of research or services
otherwise performed by the Investment Manager and thereby reduce its expenses,
it is of indeterminable value and the Fund does not reduce the management fee it
pays to the Investment Manager by any amount that may be attributable to the
value of such services.

    Subject to the principle of obtaining best price and execution, the
Investment Manager may consider a broker-dealer's sales of shares of the Fund as
a factor in selecting from among those broker-dealers qualified to provide
comparable prices and execution on the Fund's portfolio transactions. The Fund
does not, however, require a broker-dealer to sell shares of the Fund in order
for it to be considered to execute portfolio transactions, and will not enter
into any arrangement whereby a specific amount or

                                       19
<PAGE>
percentage of the Fund's transactions will be directed to a broker which sells
shares of the Fund to customers. The Trustees review, periodically, the
allocation of brokerage orders to monitor the operation of these policies.

    The Investment Manager currently serves as investment manager to a number of
clients, including other investment companies, and may in the future act as
investment manager or advisor to others. It is the practice of the Investment
Manager to cause purchase and sale transactions to be allocated among the Fund
and others whose assets it manages in such manner as it deems equitable. In
making such allocations among the Fund and other client accounts, various
factors may be considered, including the respective investment objectives, the
relative size of portfolio holdings of the same or comparable securities, the
availability of cash for investment, the size of investment commitments
generally held and the opinions of the persons responsible for managing the
portfolios of the Fund and other client accounts. In the case of certain initial
and secondary public offerings, the Investment Manager utilizes a pro rata
allocation process based on the size of the Morgan Stanley Dean Witter Funds
involved and the number of shares available from the public offering.

D. DIRECTED BROKERAGE

    During the fiscal year ended January 31, 2000, the Fund did not pay any
brokerage commissions to brokers because of research services provided.

E. REGULAR BROKER-DEALERS

    During the fiscal year ended January 31, 2000, the Fund did not purchase
securities issued by brokers or dealers that were among the ten brokers or the
ten dealers which executed transactions for or with the Fund in the largest
dollar amounts during the year. At January 31, 2000, the Fund did not own any
securities issued by any of such issuers.

VII. CAPITAL STOCK AND OTHER SECURITIES
- --------------------------------------------------------------------------------

    The shareholders of the Fund are entitled to a full vote for each full share
of beneficial interest held. The Fund is authorized to issue an unlimited number
of shares of beneficial interest. All shares of beneficial interest of the Fund
are of $0.01 par value and are equal as to earnings, assets and voting
privileges.

    The Fund's Declaration of Trust permits the Trustees to authorize the
creation of additional series of shares (the proceeds of which would be invested
in separate, independently managed portfolios) and additional Classes of shares
within any series. The Trustees have not presently authorized any such
additional series or Classes of shares other than as set forth in the
PROSPECTUS.

    The Fund is not required to hold annual meetings of shareholders and in
ordinary circumstances the Fund does not intend to hold such meetings. The
Trustees may call special meetings of shareholders for action by shareholder
vote as may be required by the Investment Company Act or the Declaration of
Trust. Under certain circumstances, the Trustees may be removed by the actions
of the Trustees. In addition, under certain circumstances, the shareholders may
call a meeting to remove the Trustees and the Fund is required to provide
assistance in communicating with shareholders about such a meeting. The voting
rights of shareholders are not cumulative, so that holders of more than 50
percent of the shares voting can, if they choose, elect all Trustees being
selected, while the holders of the remaining shares would be unable to elect any
Trustees.

    Under Massachusetts law, shareholders of a business trust may, under certain
limited circumstances, be held personally liable as partners for the obligations
of the Fund. However, the Declaration of Trust contains an express disclaimer of
shareholder liability for acts or obligations of the Fund, requires that notice
of such Fund obligations include such disclaimer, and provides for
indemnification out of the Fund's property for any shareholder held personally
liable for the obligations of the Fund. Thus, the risk of a shareholder
incurring financial loss on account of shareholder liability is limited to
circumstances in which the Fund itself would be unable to meet its obligations.
Given the above limitations on shareholder

                                       20
<PAGE>
personal liability, and the nature of the Fund's assets and operations, the
possibility of the Fund being unable to meet its obligations is remote and thus,
in the opinion of Massachusetts counsel to the Fund, the risk to Fund
shareholders of personal liability is remote.

    All of the Trustees have been elected by the shareholders of the Fund, most
recently at a Special Meeting of Shareholders held on May 21, 1997. The Trustees
themselves have the power to alter the number and the terms of office of the
Trustees (as provided for in the Declaration of Trust), and they may at any time
lengthen or shorten their own terms or make their terms of unlimited duration
and appoint their own successors, provided that always at least a majority of
the Trustees has been elected by the shareholders of the Fund.

VIII. PURCHASE, REDEMPTION AND PRICING OF SHARES
- --------------------------------------------------------------------------------

A. PURCHASE/REDEMPTION OF SHARES

    Information concerning how Fund shares are offered to the public (and how
they are redeemed and exchanged) is provided in the Fund's PROSPECTUS.

    TRANSFER AGENT AS AGENT.  With respect to the redemption or repurchase of
Fund shares, the application of proceeds to the purchase of new shares in the
Fund or any other Morgan Stanley Dean Witter Funds and the general
administration of the exchange privilege, the Transfer Agent acts as agent for
the Distributor and for the shareholder's authorized broker-dealer, if any, in
the performance of such functions. With respect to exchanges, redemptions or
repurchases, the Transfer Agent shall be liable for its own negligence and not
for the default or negligence of its correspondents or for losses in transit.
The Fund shall not be liable for any default or negligence of the Transfer
Agent, the Distributor or any authorized broker-dealer.

    The Distributor and any authorized broker-dealer have appointed the Transfer
Agent to act as their agent in connection with the application of proceeds of
any redemption of Fund shares to the purchase of shares of any other Morgan
Stanley Dean Witter Fund and the general administration of the exchange
privilege. No commission or discounts will be paid to the Distributor or any
authorized broker-dealer for any transaction pursuant to the exchange privilege.

    REDEMPTIONS.  A check drawn by a shareholder against his or her account in
the Fund constitutes a request for redemption of a number of shares sufficient
to provide proceeds equal to the amount of the check. Payment of the proceeds
will normally be made on the next business day after receipt by the Transfer
Agent of the check in proper form. If a check is presented for payment to the
Transfer Agent by a shareholder or payee in person, the Transfer Agent will make
payment by means of a check drawn on the Fund's account or, in the case of a
shareholder payee, to the shareholder's predesignated bank account, but will not
make payment in cash.

B. OFFERING PRICE

    The price of Fund shares, called "net asset value," is based on the value of
the Fund's portfolio securities.

    The Fund utilizes the amortized cost method in valuing its portfolio
securities for purposes of determining the net asset value of its shares. The
Fund utilizes the amortized cost method in valuing its portfolio securities even
though the portfolio securities may increase or decrease in market value,
generally in connection with changes in interest rates. The amortized cost
method of valuation involves valuing a security at its cost at the time of
purchase adjusted by a constant amortization to maturity of any discount or
premium, regardless of the impact of fluctuating interest rates on the market
value of the instrument. While this method provides certainty in valuation, it
may result in periods during which value, as determined by amortized cost, is
higher or lower than the price the Fund would receive if it sold the investment.
During such periods, the yield to investors in the Fund may differ somewhat from
that obtained in a similar company which uses market-to-market values for all of
its portfolio securities. For example, if the use of amortized cost resulted in
a lower (higher) aggregate portfolio value on a particular day, a prospective
investor in the Fund would be able to obtain a somewhat higher (lower) yield
than

                                       21
<PAGE>
would result from investment in such a similar company and existing investors
would receive less (more) investment income. The purpose of this method of
calculation is to facilitate the maintenance of a constant net asset value per
share of $1.00.

    The use of the amortized cost method to value the portfolio securities of
the Fund and the maintenance of the per share net asset value of $1.00 is
permitted pursuant to Rule 2a-7 of the Act (the "Rule") and is conditioned on
its compliance with various conditions contained in the Rule including: (a) the
Trustees are obligated, as a particular responsibility within the overall duty
of care owed to the Fund's shareholders, to establish procedures reasonably
designed, taking into account current market conditions and the Fund's
investment objectives, to stabilize the net asset value per share as computed
for the purpose of distribution and redemption at $1.00 per share; (b) the
procedures include (i) calculation, at such intervals as the Trustees determine
are appropriate and as are reasonable in light of current market conditions, of
the deviation, if any, between net asset value per share using amortized cost to
value portfolio securities and net asset value per share based upon available
market quotations with respect to such portfolio securities; (ii) periodic
review by the Trustees of the amount of deviation as well as methods used to
calculate it; and (iii) maintenance of written records of the procedures, and
the Trustees' considerations made pursuant to them and any actions taken upon
such consideration; (c) the Trustees should consider what steps should be taken,
if any, in the event of a difference of more than 1/2 of 1% between the two
methods of valuation; and (d) the Trustees should take such action as they deem
appropriate (such as shortening the average portfolio maturity, realizing gains
or losses, withholding dividends or, as provided by the Declaration of Trust,
reducing the number of outstanding shares of the Fund) to eliminate or reduce to
the extent reasonably practicable material dilution or other unfair results to
investors or existing shareholders which might arise from differences between
the two method of valuation.

    Generally, for purposes of the procedures adopted under the Rule, the
maturity of a portfolio security is deemed to be the period remaining
(calculated from the trade date or such other date on which the Fund's interest
in the instrument is subject to market action) until the date on which in
accordance with the terms of the security the principal amount must
unconditionally be paid, or in the case of a security called for redemption, the
date on which the redemption payment must be made.

    A variable rate security that is subject to a demand feature is deemed to
have a maturity equal to the period remaining until the principal amount can be
recovered through demand. A floating rate security that is subject to a demand
feature is deemed to have a maturity equal to the period remaining until the
principal amount can be recovered through demand.

    An "NRSRO" is a nationally recognized statistical rating organization. The
term "Requisite NRSROs" means (i) any two NRSROs that have issued a rating with
respect to a security or class of debt obligations of an issuer, or (ii) if only
one NRSRO has issued a rating with respect to such security or issuer at the
time a fund purchases or rolls over the security, that NRSRO.

    An Eligible Security is generally defined in the Rule to mean (i) a rated
security with a remaining maturity of 397 calendar days or less that has
received a rating from the Requisite NRSROs in one of the two highest short-term
rating categories (within which there may be sub-categories or gradations
indicating relative standing); or (ii) An Unrated Security that is of comparable
quality to a security meeting the requirements of (1) above, as determined by
Trustees; (iii) In addition, in the case of a security that is subject to a
Demand Feature or Guarantee: (A) The Guarantee has received a rating from an
NRSRO or the Guarantee is issued by a guarantor that has received a rating from
an NRSRO with respect to a class of debt obligations (or any debt obligation
within that class) that is comparable in priority and security to the Guarantee,
unless: (1) the Guarantee is issued by a person that directly or indirectly,
controls, is controlled by or is under a common control with the issuer of the
security subject to the Guarantee (other than a sponsor or a Special Purpose
Entity with respect to an Asset Backed Security: (2) the security subject to the
Guarantee is a repurchase agreement that is Collateralized Fully; or (3) the
Guarantee itself is a Government Security and (B) the issuer of the Demand
Feature, or another institution, has undertaken promptly to notify the holder of
the security in the event the Demand Feature

                                       22
<PAGE>
or Guarantee is substituted with another Demand Feature or Guarantee (if such
substitution is permissible under the terms of the Demand Feature or Guarantee).
The Fund will limit its investments to securities that meet the requirements for
Eligible Securities.

    As permitted by the Rule, the Trustees have delegated to the Fund's
Investment Manager the authority to determine which securities present minimal
credit risks and which unrated securities are comparable in quality to rated
securities.

    Also, as required by the Rule, the Fund will limit its investments in
securities, other than Government securities, so that, at the time of purchase:
(a) except as further limited in (b) below with regard to certain securities, no
more than 5% of its total assets will be invested in the securities of any one
issuer; and (b) with respect to Eligible Securities that have received a rating
in less than the highest category by any one of the NRSROs whose ratings are
used to qualify the security as an Eligible Security, or that have been
determined to be of comparable quality: (i) no more than 5% in the aggregate of
the Fund's total assets in all such securities, and (ii) no more than the
greater of 1% of total assets, or $1 million, in the securities on any one
issuer.

    The Rule further requires that the Fund limit its investments to U.S.
dollar-denominated instruments which the Trustees determine present minimal
credit risks and which are Eligible Securities. The Rule also requires the Fund
to maintain a dollar-weighted average portfolio maturity (not more than 90 days)
appropriate to its objective of maintaining a stable net asset value of $1.00
per share and precludes the purchase of any instrument with a remaining maturity
of more than 397 days. Should the disposition of a portfolio security result in
a dollar-weighted average portfolio maturity of more than 90 days, the Fund will
invest its available cash in such a manner as to reduce such maturity to 90 days
or less a soon as is reasonably practicable.

    If the Trustees determine that it is no longer in the best interests of the
Fund and its shareholders to maintain a stable price of $1 per share or if the
Trustees believe that maintaining such price no longer reflects a market-based
net asset value per share, the Trustees have the right to change from an
amortized cost basis of valuation to valuation based on market quotations. The
Fund will notify shareholders of the Fund of any such change.

IX. TAXATION OF THE FUND AND SHAREHOLDERS
- --------------------------------------------------------------------------------

    The Fund intends to distribute all of its daily net investment income (and
net short-term capital gains, if any) to shareholders of record as of the close
of business the preceding business day. Net income, for dividend purposes,
includes accrued interest and amortization of acquisition, original issue and
market discount, plus or minus any short-term gains or losses realized on sales
of portfolio securities, less the amortization of market premium and the
estimated expenses of the Fund. Net income will be calculated immediately prior
to the determination of net asset value per share of the Fund.

    The Trustees of the Fund may revise the dividend policy, or postpone the
payment of dividends, if the Fund should have or anticipate any large unexpected
expense, loss or fluctuation in net assets which, in the opinion of the
Trustees, might have a significant adverse effect on shareholders. On occasion,
in order to maintain a constant $1.00 per share net asset value, the Trustees
may direct that the number of outstanding shares be reduced in each
shareholder's account. Such reduction may result in taxable income to a
shareholder in excess of the net increase (i.e., dividends, less such
reductions), if any, in the shareholder's account for a period of time.
Furthermore, such reduction may be realized as a capital loss when the shares
are liquidated.

    It has been and remains the Trust's policy and practice that, if checks for
dividends or distributions paid in cash remain uncashed, no interest will accrue
on amounts represented by such uncashed checks.

                                       23
<PAGE>
    INVESTMENT COMPANY TAXATION.  The Fund has qualified and intends to remain
qualified as a regulated investment company under Subchapter M of the Internal
Revenue Code. If so qualified, the Fund will not be subject to federal income
taxes, provided that it distributes all of its taxable net investment income and
all of its net realized gains.

    Gains or losses on sales of securities held by the Fund will be long-term
capital gains or losses if the securities have a tax holding period of more than
one year. Gains or losses on the sale of securities with a tax holding period of
one year or less will be short-term gains or losses.

    Under present Massachusetts law, the Fund is not subject to any
Massachusetts income tax during any fiscal year in which the Fund qualifies as a
regulated investment company. The Fund might be subject to Massachusetts income
taxes for any taxable year in which it does not so qualify as a regulated
investment company.

    The Fund may be subject to tax or taxes in certain states where it does
business. Furthermore, in those states which have income tax laws, the tax
treatment of the Fund and of shareholders with respect to distributions by the
Fund may differ from federal tax treatment.

    TAXATION OF DIVIDENDS AND DISTRIBUTIONS.  Shareholders will normally be
subject to federal income tax, and any state and local income taxes, on
dividends paid from interest income derived from taxable securities and on
distributions of realized net short-term capital gains and long-term capital
gains. Interest and realized net short-term capital gains distributions are
taxable to the shareholder as ordinary dividend income regardless of whether the
shareholder receives such distributions in additional shares or in cash. Since
the Trust's income is expected to be derived entirely from interest rather than
dividends, none of such distributions will be eligible for the federal dividends
received deduction available to corporations. Realized net long-term capital
gains distributions, if any, are taxable as long-term capital gains, regardless
of how long the shareholder has held the Fund shares and regardless of whether
the distribution is received in additional shares or in cash. Realized net
long-term capital gains distributions are not eligible for the dividends
received deduction.

    Shareholders who are not citizens or residents of the United States and
certain foreign entities may be subject to withholding of United States tax on
distributions made by the Fund of any taxable interest income and short-term
capital gains.

    After the end of each calendar year, shareholders will be sent information
on their dividends and capital gain distributions for tax purposes, including
the portion taxable as ordinary income, the portion taxable as long-term capital
gains and the amount of any dividends eligible for the federal dividends
received deduction for corporations.

    Shareholders are urged to consult their own tax advisors regarding specific
questions as to federal, state or local taxes.

X. UNDERWRITERS
- --------------------------------------------------------------------------------

    The Fund's shares are offered to the public on a continuous basis. The
Distributor, as the principal underwriter of the shares, has certain obligations
under the Distribution Agreement concerning the distribution of the shares.
These obligations and the compensation the Distributor receives are described
above in the sections titled "Principal Underwriter" and "Rule 12b-1 Plan."

XI. CALCULATION OF PERFORMANCE DATA
- --------------------------------------------------------------------------------

    The Fund's current yield for the seven days ending January 31, 2000 was
4.90%. The seven day effective yield on January 31, 2000, was 5.02% assuming
daily compounding.

    The Fund's annualized current yield, as may be quoted from time to time in
advertisements and other communications to shareholders and potential investors,
is computed by determining, for a stated seven-day period, the net change,
exclusive of capital changes and including the value of additional

                                       24
<PAGE>
shares purchased with dividends and any dividends declared therefrom (which
reflect deductions of all expenses of the Fund such as management fees), in the
value of a hypothetical pre-existing account having a balance of one share at
the beginning of the period, and dividing the difference by the value of the
account at the beginning of the base period to obtain the base period return,
and then multiplying the base period return by (365/7).

    The Fund's annualized effective yield, as may be quoted from time to time in
advertisements and other communications to shareholders and potential investors,
is computed by determining (for the same stated seven-day period as for the
current yield), the net change, exclusive of capital changes and including the
value of additional shares purchased with dividends and any dividends declared
therefrom (which reflect deductions of all expenses of the Fund such as
management fees), in the value of a hypothetical pre-existing account having a
balance of one share at the beginning of the period, and dividing the difference
by the value of the account at the beginning of the base period to obtain the
base period return, and then compounding the base period return by adding 1,
raising the sum to a power equal to 365 divided by 7, and subtracting 1 from the
result.

    The yields quoted in any advertisement or other communication should not be
considered a representation of the yields of the Fund in the future since the
yield is not fixed. Actual yields will depend not only on the type, quality and
maturities of the investments held by the Fund and changes in interest rates on
such investments, but also on changes in the Fund's expenses during the period.

    Yield information may be useful in reviewing the performance of the Fund and
for providing a basis for comparison with other investment alternatives.
However, unlike bank deposits or other investments which typically pay a fixed
yield for a stated period of time, the Fund's yield fluctuates.

    The Fund may also advertise the growth of hypothetical investments of
$10,000, $50,000 and $100,000 in shares of the Fund by adding the sum of all
distributions on 10,000, 50,000 or 100,000 shares of the Fund since inception to
$10,000, $50,000 and $100,000, as the case may be. Investments of $10,000,
$50,000 and $100,000 in the Fund at inception (February 17, 1982) would have
grown to $28,136, $140,680 and $281,360, respectively, at January 31, 2000.

XII. FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------

    EXPERTS.  The financial statements of the Fund for the fiscal year ended
January 31, 2000 included in the PROSPECTUS and incorporated by reference in
this STATEMENT OF ADDITIONAL INFORMATION have been so included and incorporated
in reliance on the report of PricewaterhouseCoopers LLP, independent
accountants, given on the authority of said firm as experts in auditing and
accounting.

                                     *****

    This STATEMENT OF ADDITIONAL INFORMATION and the PROSPECTUS do not contain
all of the information set forth in the REGISTRATION STATEMENT the Fund has
filed with the SEC. The complete REGISTRATION STATEMENT may be obtained from the
SEC.

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