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The Treasury sold $37 billion of three-month bills at an interest rate of 0.320 percent, up from 0.300 percent last week.
The ratio of bids to the amount offered was 3.18, down from 3.41 the prior week.
This measure on overall auction demand was the lowest since 3.13 set at a three-month T-bill sale on Oct. 15, 2013.