Rates on US Treasury bills flat to higher in weekly auction

The Treasury Department auctioned $34 billion in three-month bills at a discount rate of 0.490 percent, unchanged from last week.

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, rose to 0.80 percent last Friday after starting last week at 0.79 percent.