Abstract
Prior studies typically report that real Treasury bill returns have a unit root. The unit-root findings are not consistent with the long-run Fisher effect and consumptionbased asset pricing models. This study examines a data set of ex ante real returns on US Treasury bills and commercial papers. The statistical analysis employs a new modified Dickey-Fuller test, whc has better power than standard unit-root tests. In contrast to previous findings, strong evidence of stationarity is found for all the real return series under examination. Implications of the results are discussed.
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