In their largest one-week move so far this year, tax-exempt money market funds gained a stunning 1.9%, or $5.27 billion, from last week, bringing assets in the week ended Dec. 5 to $289.94 billion, according to the Money Fund Report, a service of iMoneyNet.com.

It was also the biggest one-week increase in tax-exempt assets for the year, noted Mike Krasner, managing editor of iMoneyNet Inc., which compiles the report. This week’s inflows, in particular, compare favorably to the $1.56 billion of outflows that dragged down total net assets to $284.67 billion the week before, in a year in which inflows have been few and far between.

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