Interest rates on short-term Treasury bills fell in Monday's auction to their lowest levels in three weeks.
The Treasury Department auctioned $20 billion in three-month bills at a discount rate of 0.055 percent, down from 0.075 percent last week. Another $20 billion in six-month bills was auctioned at a discount rate of 0.260 percent, down from 0.275 percent last week.
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The three-month rate was the lowest since three-month bills averaged 0.050 percent on Aug. 24. The six-month rate was the lowest since those bills averaged 0.200 percent, also on Aug. 24.
The discount rates reflect that the bills sell for less than face value. For a $10,000 bill, the three-month price was $9,998.61, while a six-month bill sold for $9,986.86. That would equal an annualized rate of 0.56 percent for the three-month bills and 0.265 percent for the six-month bills.
Separately, the Federal Reserve said Monday that the average yield for one-year Treasury bills, a popular index for making changes in adjustable rate mortgages, edged up to 0.39 percent last week from 0.37 percent the previous week.