When Fidelity Investments reported day-old prices for its mutual funds on June 17, bankers heard barely a peep from customers. But the episode served as a strong reminder that slipups in fund pricing can cause major headaches, bankers say.

One of the attractions of mutual funds is that customers can follow the prices of their investments in the daily newspaper. But when fund companies report the prices incorrectly, as Fidelity did earlier this month, one worry is that customer confidence in the funds could be undermined.

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