Over the last week, big banks and companies have withdrawn $37.5 billion from money market funds that invest in Treasury debt and other ultra-safe securities, the biggest weekly drop this year. Meanwhile, in the vast market for repurchase agreements, in which many financial firms make short-term loans to one another, borrowers are beginning to demand higher yields.
In the first three days of this week, investors pulled $17 billion from funds that invested only in government securities, a reversal of the daily inflows of $280 million for much of July, said Peter Crane, the president of Crane Data, which tracks money market mutual funds.
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