After the arrival of last week’s bounty, outflows of $1.61 billion left tax-exempt money market funds with $272.34 billion in total net assets for the week ended Aug. 13, according to the Money Fund Report, a service of iMoneyNet.com.

The outflows chipped away at the $4.050 billion that the funds amassed last week when total net assets rose to $273.94 billion. Flows have been fluctuating week to week. In the week ended July 30, for instance, the funds saw outflows of $1.818 billion, leaving total net assets at $269.89 billion.

This week, the average, seven-day simple yield for the 438 reporting tax-exempt money funds remained at 0.01% for the 11th week in a row, while the average ­maturity increased by one day to 33 days.

In the taxable arena, the arrival of $20.94 billion in new cash increased total net assets to $2.280 trillion in the week ended Aug. 14, versus the previous week, when assets ended at $2.259 trillion after $386.3 million fled the funds. For the week ended July 31, the funds settled at $2.260 trillion after gaining $1.460 billion in new cash.

This week, the average, seven-day simple yield for the 1,080 reporting taxable funds fell one basis point to 0.02% compared to the week before, while the average maturity remained at 46 days.

Overall, the combined assets of the 1,518 reporting money funds grew by $19.34 billion, which caused total net assets to rise to $2.553 trillion in the week ended Aug. 14.

That compares to the previous week when total net assets settled at $2.533 trillion after gaining $3.663 billion in new cash, and to the week ended July 31 when the funds lost $358.3 million and total net assets settled at $2.530 trillion.

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