Tax-exempt money market funds slipped $1.08 billion to $337.07 billion for the week ending Sept. 13 after experiencing their first inflows in nearly a month the week before, according to the Money Fund Report, a service of iMoneyNet.com.

The outflows come on the heels of a modest $244.5 million buildup the week ending Sept. 6 when the tax-exempt funds closed with $338.1 billion in total net assets.

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