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Systematic Patterns in Daily Treasury Bill Returns and Spreads

Nonparametric tests reject that rankings of Treasury bill returns are random within months. Treasury bills tend to earn lower returns on the first trading day of the month of January. This pattern in January does not extend to the other months of the year. Unlike stocks, bill returns are approximately equal during the first and second half of the month. Bid-ask spreads, however, are much larger during the second half of the month than during the first.