Uncovered Interest Rate Parity Over the Past Two Centuries
39 Pages Posted: 2 Sep 2004
Date Written: June 12, 2003
Abstract
Uncovered interest rate parity (UIP) is one of three key theoretical relations used in analytical work in both international finance and international monetary economics. The problem, however, is that UIP does not seem to hold up well empirically. In this paper, we argue that the failures of UIP that have been so widely documented are a coincidence of two empirical artifacts: (1) the unique sample period of the 1980s and (2) The noise induced by small UIP deviations. We control for these empirical artifacts by constructing an ultra long time series that spans two centuries and by running regressions conditional on large deviations from UIP. We find that traditional regressions yield positive slope estimates over the whole sample period and become negative only when the sample is dominated by the period of 1980s. We argue that the negative estimates during this sample period are mainly the result of a failure of expectations to adjust quickly to the regime changes in monetary policy that took place in both the United Kingdom and the United States. We also find that large interest rate differentials have significantly stronger forecasting powers for currency movements than small interest rate differentials. Finally, a historical account of expected and realized regime changes further illustrates how the expectation hypothesis holds over the very long haul but can be deviated from for a long period of time due to slow adjustment of expectations to actual regime changes or to anticipations for extended periods of regime changes or other big events that never materialize.
Keywords: Uncovered interest rate parity,expectation hypothesis, regime changes, small sample problem, Peso problem, extreme sampling
JEL Classification: G12, F31
Suggested Citation: Suggested Citation
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