Investors began a run on The Reserve's Primary Fund last Monday when Lehman's bankruptcy news made them fearful about the money market funds' $785 million exposure to the investment bank's previously blue-chip commercial paper and medium-term notes that had fallen to zero value.

On Tuesday, the oldest money market fund in the U.S. and previously one of the largest, announced the shocking news that it broke the buck, falling to 97 cents on the dollar.

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