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NATIONAL BUREAU OF ECONOMIC RESEARCH

NBER Working Papers by Benjamin Hebert

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Working Papers

August 2011Natural Expectations, Macroeconomic Dynamics, and Asset Pricing
with Andreas Fuster, David Laibson: w17301
How does an economy behave if (1) fundamentals are truly hump-shaped, exhibiting momentum in the short run and partial mean reversion in the long run, and (2) agents do not know that fundamentals are hump-shaped and base their beliefs on parsimonious models that they fit to the available data? A class of parsimonious models leads to qualitatively similar biases and generates empirically observed patterns in asset prices and macroeconomic dynamics. First, parsimonious models will robustly pick up the short-term momentum in fundamentals but will generally fail to fully capture the long-run mean reversion. Beliefs will therefore be characterized by endogenous extrapolation bias and pro-cyclical excess optimism. Second, asset prices will be highly volatile and exhibit partial mean reversion--i...

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