The 1990s may be remembered as the decade of the B share when mutual fund historians look at trends in how funds were sold through intermediaries.

B shares - the fund class that imposes a sales charge over several years rather than at the time of purchase - last year for the first time accounted for more than 50 percent of the mutual fund industry's sales in the wholesale channel, according to Financial Research Corp. of Boston, a mutual fund tracking and consulting firm.

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