Money market funds have started to increase fees after cutting them during the days of low returns. Now that the economy is doing well, enough for money market fund yields to rise, funds are pushing up expense fees, according to Bankrate.com.

"It was a temporary phenomenon by some funds to keep from going underwater. I would guess a sizeable portion will reinstate their fees to a point. Some may not reinstate the entire fee; they may see this as an opportunity to gain a shade more yield than their competitors," says Jeff Keil, vice president of Global Fiduciary Review at Lipper.

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