PROSPECTUS Dated May 5, 1999 Pricing Supplement No. 31 to
PROSPECTUS SUPPLEMENT Registration Statement No. 333-75289
Dated May 6, 1999 December 23, 1999
Rule 424(b)(3)
Morgan Stanley Dean Witter & Co.
MEDIUM-TERM NOTES, SERIES C
Senior Floating Rate Notes
-------------------
We will not redeem these Medium-Term Notes, Series C (Senior Floating Rate
Notes) prior to the maturity date. We describe the basic features of this type
of note in the section called "Description of Notes--Floating Rate Notes" in the
accompanying prospectus supplement, subject to and as modified by the provisions
described below.
Principal Amount: $176,000,000
Maturity Date: January 22, 2001
Interest Accrual Date: December 29, 1999
Interest Payment Dates: Each March 22, June 22, September 22 and
December 22, commencing March 22, 2000, and the
Maturity Date
Initial Interest Rate: To be determined two London banking days
prior to the Original Issue Date
Base Rate: LIBOR
Index Maturity: 3 Months
Spread Plus or Minus): Plus 0.02% per annum
Index Currency: U.S. Dollars
Interest Payment Period: Quarterly
Specified Currency: U.S. Dollars
Issue Price: 100%
Settlement Date
(Original Issue Date): December 29, 1999
Initial Interest Reset
Date: March 22, 2000
Interest Reset Dates: Same as quarterly Interest Payment Dates
Interest Reset Period: Quarterly
Interest Determination
Dates: Two London banking days prior to each
Interest Reset Date
Reporting Service: Telerate (Page 3750)
Book Entry Note or
Certificated Note: Book Entry Note
Senior Note or
Subordinated Note: Senior Note
Agent: Morgan Stanley & Co. Incorporated
Calculation Agent: The Chase Manhattan Bank
Minimum Denomination: $1,000
CUSIP: 61745ENV9
Terms not defined above have the meanings given to such terms in the
accompanying prospectus supplement.
MORGAN STANLEY DEAN WITTER
