Behavioral heterogeneity in return expectations across equity style portfolios

Philip Stork, Milan Vidojevic and Remco C. J. Zwinkels

International Review of Finance, 2021, vol. 21, issue 4, 1225-1250

Abstract: We estimate a heterogeneous agent model on five prominent equity investment styles—value, size, profitability, investment, and momentum—and find evidence for behavioral heterogeneity in expected return formation. Our model features two groups of boundedly rational investors, fundamentalists and chartists, whose demand functions for the investment styles depend on their respective expected style return forecasts. The fundamentalists form return expectations using a model based on time‐varying stock‐level characteristics and dynamic factor premia, and the chartists do so based on heuristics commonly employed by technical analysts, such as moving average rules. Our results cast doubt on the theories that assume perfect rationality of the representative agent in financial markets, and give support to the behavioral theories with heterogeneous agents.

Date: 2021
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