Abstract
This paper examines holding period returns to constant duration portfolios of U.S. Government notes and bonds, and measures the return premium generated by liquidity differences in bonds. The approach compares constant duration portfolios constructed in two distinct ways: one using only bonds issued in the most recent Treasury auction, one using all other bonds. Comparisons of the resulting series are made meaningful by choosing narrow duration ranges in the portfolio formation procedure. This, in turn, induces a missing data problem in the created time series. Parameters of return distributions are therefore estimated employing a maximum likelihood framework that explicitly accounts for the missing data. It is estimated that recently issued bonds are priced to return a premium of around 55 basis points per annum over otherwise equivalent instruments.

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