J.P. Morgan & Co.'s mutual fund group attributes its 72% increase in assets under management last year to ratcheting up its sales and marketing efforts.

Morgan's fund family, which had $20.1 billion under management at yearend, grew at more than twice the rate of bank-affiliated funds as a group, which increased 28.2%. Three-quarters of the surge in assets came from net sales. And the bank bested its previous year's performance, when assets grew at the more typical rate of 30%.

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