Its return of 8.85 percent was down a basis point from the previous week.
"At current rate levels, one basis point on $100 million is worth about $90,000 in present value terms," he said.
Money market accounts were off an average of one basis point, at 6.55 percent.
Money market accounts were off 4 basis points, to 6.85 percent.
The money market account was up by one basis point, to 7.03 percent.
Two weeks ago, the spread was just 12 basis points.
And 30-day commercial paper rates also increased by 10 basis points, to 7.15 percent.
Interest rates were set at 17.5 basis points, above the 30-day commercial paper rate.
The average money market account fell one basis point, to 6.23 percent.
Money market accounts were off 8 basis points, to 6.99 percent.