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The ratio of bids submitted to the amount of one-year or 52-week bills offered was 3.37, lower than the 3.44 seen in June and the lowest since December 2009.
Meanwhile, the Treasury will pay on $40 billion in one-month bills at an interest rate of 0.035 percent, which was the highest since March 31 and above 0.020 percent a week earlier, according to Treasury data.
The bid-to-cover ratio at the latest one-month bill auction was 3.52. This was above prior week's 2.98 which was the lowest since October 2003.