When does determinacy imply expectational stability?

James Bullard and Stefano Eusepi

No 2008-007, Working Papers from Federal Reserve Bank of St. Louis

Abstract: In the recent literature on monetary and fiscal policy design, adoption of policies that induce both determinacy and learnability of equilibrium has been considered fundamental to economic stabilization. We study the connections between determinacy of rational expectations equilibrium, and expectational stability or learnability of that equilibrium, in a general class of purely forward-looking models. We ask what types of economic assumptions drive differences in the necessary and sufficient conditions for the two criteria. We apply our result to a relatively general New Keynesian model. Our framework is sufficiently flexible to encompass lags in information, a cost channel for monetary policy, and either Euler equation or infinite horizon approaches to learning. We are able to isolate conditions under which determinacy does and does not imply learnability, and also conditions under which long horizon forecasts make a clear difference to conclusions about expectational stability. The sharpest result is that informational delays break equivalence connections between determinacy and learnability.

Keywords: Rational; expectations; (Economic; theory) (search for similar items in EconPapers)
Date: 2009
New Economics Papers: this item is included in nep-cba and nep-mac
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Citations: View citations in EconPapers (2)

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Related works:
Journal Article: WHEN DOES DETERMINACY IMPLY EXPECTATIONAL STABILITY? (2014)
Working Paper: When Does Determinacy Imply Expectational Stability? (2008)
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