Tax-exempt money market funds lost a sizable $2.09 billion, dropping total net assets to $326.88 billion for the week ending Dec. 13 and erasing nearly all gains from the previous week, according to the Money Fund Report, a service of iMoneyNet.com.

The outflows came on the heels of $3.41 billion of inflows last week. The back-and-forth followed two consecutive weekly outflows that saw total net assets fall to $328.97 billion.

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