The Term Structure and the Expectations Hypothesis:
a Threshold Model
Matteo Modena
University of Glasgow
First Draft: May 2007
This Draft: July 2008
Abstract
The expectations hypothesis implies that rational investors can predict future changes in interest rates by simply
observing the yield spread. According to Mishkin (1990) the expectations theory can also be reformulated in
terms of the ability of the spread to predict future inflation. Unfortunately, although appealing, the theory has
found little empirical support. Time-varying term premia and changing risk perception have been advocated to
rationalize the aforementioned weak empirical evidence. In this work we suggest that the time-varying nature of
term premia makes single-equation models inappropriate to analyse the informative content of the term structure.
In particular, when the deviations between the expected and the actual spread are large, which occurs in times of
soaring term premia volatility, linear models fail to support the expectations theory. Within a threshold model for
term premia, we provide evidence that the yield spread contains valuable information to predict future interest
rates changes once the risk-averse attitude of economic agents is appropriately considered. Empirical results show
that the predictive ability of the yield spread is contingent on the level of uncertainty as captured by the size of
monetary policy surprise.
JEL classification: C01, C30, E43, G12.
Keywords: Expectations Hypothesis, Term Premia, Threshold Models.
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