After one week of inflows, tax-exempt money market funds returned to negative territory, losing $7.3 billion for the week ending March 16 with $485.76 billion, according to the Money Fund Report, a service of iMoneyNet.com.

The previous week, ending March 9, tax-free money funds hit $485.77 billion after gaining $3.65 billion, marking only the third time that the funds have generated inflows since January.

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