Tax-free money market funds rang in 2009 with inflows of $8.23 billion, the highest single-week gain since the massive fourth-quarter outflows spurred by the national economic crisis. As a result, the funds reached $500.05 billion in total assets for the week ending Jan. 5, according to the Money Fund Report, a service of iMoneyNet.com.

By comparison, the assets of tax-free money funds rose $1.25 billion to $491.81 billion for the week ending Dec. 29. That was up from the week ending Dec. 22 when they decreased by $1.41 billion to $490.57 billion.

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