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Inflation Uncertainty and Interest Rates: Theory and Empirical Tests

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  • Richard Hartman
  • John H. Makin

Abstract

This paper develops two models, one involving risk neutrality and the other risk aversion, which suggest that inflation uncertainty affects interest rates. Both models give rise to essentially the same interest rate equation for estimation. Empirical evidence supports the hypothesis that inflation uncertainty affects interest rates. Interpreted in terms of the risk neutral model, the empirical results suggest that inflation uncertainty has a negative impact on nominal interest rates and a positive impact on the expected real rate. If the results are interpreted in terms of the risk averse model, inflation uncertainty has a negative impact on nominal interest rates. The expected real rate is not of direct interest in a risk averse world. The results raise real questions about the use of the Fisherian definition of the real interest rate in situations when there is uncertainty about inflation rates. It is argued that even with risk neutrality the Fisherian definition of the real rate is not the appropriate concept upon which to base economic decisions if inflation uncertainty is present. The appropriate concept is an expected real rate which involves an adjustment for uncertainty. Moreover, if the world is risk averse, the expected real rate is not a relevant concept for economic decisions.

Suggested Citation

  • Richard Hartman & John H. Makin, 1982. "Inflation Uncertainty and Interest Rates: Theory and Empirical Tests," NBER Working Papers 0906, National Bureau of Economic Research, Inc.
  • Handle: RePEc:nbr:nberwo:0906
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    References listed on IDEAS

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    Cited by:

    1. John H. Makin & Vito Tanzi, 1983. "The Level and Volatility of Interest Rates in the United States: The Roles of Expected Inflation, Real Rates, and Taxes," NBER Working Papers 1167, National Bureau of Economic Research, Inc.
    2. Bradford Cornell, 1986. "Inflation Measurement, Inflation Risk, And The Pricing Of Treasury Bills," Journal of Financial Research, Southern Finance Association;Southwestern Finance Association, vol. 9(3), pages 193-202, September.

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