MASTER BASIC VALUE TRUST, N-1A, EX-99.12B, 2000-10-13

MASTER BASIC VALUE TRUST
N-1A, EX-99.12B, 2000-10-13

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                                                                   Exhibit 12(b)


                 CERTIFICATE OF HOLDER OF BENEFICIAL INTERESTS

          Mercury Basic Value Fund, Inc., a future holder of beneficial
interests in the amount of $100,000, of Master Basic Value Trust (the "Trust"),
does hereby confirm to the Trust its representations that it will purchase such
shares for investment purposes, with no present intention of redeeming or
reselling any portion thereof.

                                   Mercury Basic Value Fund, Inc.


                                   By:   /s/ Terry K. Glenn
                                         ----------------------------
                                         Name: Terry K. Glenn



Dated:  October 13, 2000