Abstract

The return regression methodology is used to test for mean reversion in the forward market for US T-bills over the period 1964 to 1995. Substantial evidence of mean reversion is found in one- to ten-month forward spreads over the 12 to 24 month horizon. Such evidence is indicative of market inefficiency or speculative dynamics in models with time-invariant term premia. This is not necessarily the case, however, in models with time-varying term premia. We show that forward premia estimated using a multi-factor GARCH model accounts for this evidence, thus reconciling the evidence of mean reversion with market efficiency.

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