Asset Return Dynamics and Learning

William A. Branch () and George William Evans ()

University of Oregon Economics Department Working Papers from University of Oregon Economics Department

Abstract: This paper advocates a theory of expectation formation that incorporates many of the central motivations of behavioral finance theory while retaining much of the discipline of the rational expectations approach. We provide a framework in which agents, in an asset pricing model, underparameterize their forecasting model in a spirit similar to Hong, Stein, and Yu (2005) and Barberis, Shleifer, and Vishny (1998), except that the parameters of the forecasting model, and the choice of predictor, are determined jointly in equilibrium. We show that multiple equilibria can exist even if agents choose only models that maximize (risk-adjusted) expected profits. A real-time learning formulation yields endogenous switching between equilibria. We demonstrate that a real-time learning version of the model, calibrated to U.S. stock data, is capable of reproducing many of the salient empirical regularities in excess return dynamics such as under/overreaction, persistence, and volatility clustering.

Keywords: Asset pricing; misspecification; behavioral finance; predictability; adaptive learning (search for similar items in EconPapers)
JEL-codes: G12 G14 D82 D83 (search for similar items in EconPapers)
New Economics Papers: this item is included in nep-cba
Date: Written 2006-11-13
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