Money market mutual fund assets fell 0.01%, to $766.99 billion, for the week ended Dec. 20, the Investment Company Institute said.

Though assets in institutional money funds climbed $297.7 million during the week, that gain didn't offset the $1.36 billion that flowed out of retail portfolios.

Taxable retail funds fell $788.2 million to $435.38 billion, while tax- exempt funds decreased $570.5 million to $102.53 billion.

On the institutional front, taxable portfolios rose $301.6 million to $203.03 billion. Tax-free funds, however, fell $3.9 million to $25.15 billion.

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