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Learning and Macroeconomics

George Evans () and Seppo Honkapohja ()

Annual Review of Economics, 2009, vol. 1, issue 1, 421-451

Abstract: Expectations play a central role in modern macroeconomic theories. The econometric learning approach models economic agents as forming expectations by estimating and updating forecasting models in real time. The learning approach provides a stability test for rational expectations and a selection criterion in models with multiple equilibria. In addition, learning provides new dynamics if older data are discounted, if models are misspecified, or if agents choose between competing models. This paper describes the expectational stability (E-stability) principle and the stochastic approximation tools used to assess equilibria under learning. Applications of learning to a number of areas are reviewed, including the design of monetary and fiscal policy, business cycles, self-fulfilling prophecies, hyperinflation, liquidity traps, and asset prices.

Keywords: E-stability; stochastic approximation; persistent learning dynamics; business cycles; monetary policy; asset prices (search for similar items in EconPapers)
JEL-codes: D83 E13 E32 E52 (search for similar items in EconPapers)
Date: 2009
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