Another week, another new record for money market fund assets.

Money funds took in nearly $18 billion in the week to September 13, data released late Thursday in the US showed.

It was the eighth inflow in nine weeks and the ninth in 11.

This week’s haul was a solid encore following the prior week’s $41.8 billion take.

Total assets now sit at $5.643 trillion, and the YTD inflow to US money funds stood at $908 billion after this week.

Suffice to say there’s plenty of “sponge” (if you will) for T-bill supply. Bill auction stopout rates have been slightly below the RRP rate, ostensibly disincentivizing money funds, but as a few analysts noted this week, demand can’t be too lackluster otherwise yields would move above the RRP rate, at which point demand would presumably materialize as investors with RRP access would be coaxed into bills.

RRP balances dropped below $1.5 trillion on Thursday amid bill settlements, and may fall again Friday, another settlement day.

Primary dealer bill holdings rose fairly sharply in the week to September 6, when they neared $70 billion. The high, you’re reminded, was $116 billion in early July.

Meanwhile, usage of the Fed’s Bank Term Funding Program, the emergency backstop established in SVB’s wake, edged up to a new record just shy of $108 billion.

Discount window usage moved up to $2.7 billion.

Between the two facilities, borrowing from the Fed was $110.7 billion as of September 13.

Related: Benign RRP-Reserve Dynamic May Last Through Year-End