RALEIGH, N.C. — Fannie Mae and Freddie Mac are gradually increasing the guarantee fees they charge mortgage lenders and may discontinue the volume discounts they give large banks, a top regulatory official said on Monday.

Ed DeMarco, acting director of the Federal Housing Finance Agency, said the volume discounts given to large banks like Bank of America Corp. and Wells Fargo & Co. may be phased out because they were "based on competition between the enterprises to gain market share."

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