Assets invested in money market mutual funds edged up 0.048%, to $1.0464 trillion, in the week ended Oct. 22, the Investment Company Institute reported.

The increase was concentrated in funds for retail investors. Balances of these portfolios rose 1%, to $687.05 billion. That includes $564.76 billion in taxable funds, up $1.07 billion, and $122.29 billion in tax-exempt funds, down $206 million.

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