Abstract
The Pure Expectations Hypothesis (PEH) serves as the benchmark model for the relationship between yields on bonds of different maturities. When coupled with rational expectations, however, empirical renderings of the model fail miserably. I explore the possibility that failure to account for changes in monetary policy regime explains much of the failure of the PEH. Estimating changing monetary regimes in conjunction with the PEH significantly improves its performance. The predicted spread between the long and short rates is highly correlated with the actual spread. The standard deviation of the theoretical spread is nearly identical to that of the actual spread.

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