in the week that ended April 8, the Investment Company Institute reported. The decline was sharpest among funds for institutional investors. They held $450.44 billion, down $13.17 billion in the week. Balances of retail funds fell $7.15 billion, to $712.11 billion. The institute, a Washington-based trade group for mutual funds companies, surveys more than 1,000 money market funds each week.

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