NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Michael Johannes

School of Business
Columbia University
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NBER Working Papers and Publications

December 2013Parameter Learning in General Equilibrium: The Asset Pricing Implications
with Pierre Collin-Dufresne, Lars A. Lochstoer: w19705
Parameter learning strongly amplifies the impact of macro shocks on marginal utility when the representative agent has a preference for early resolution of uncertainty. This occurs as rational belief updating generates subjective long-run consumption risks. We consider general equilibrium models with unknown parameters governing either long-run economic growth, the variance of shocks, rare events, or model selection. Overall, parameter learning generates long-lasting, quantitatively significant additional macro risks that help explain standard asset pricing puzzles.
 
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