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Ambiguity Aversion and Underdiversification

Published online by Cambridge University Press:  01 November 2016

Massimo Guidolin  and
Hening Liu
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Abstract

We examine asset allocation decisions under smooth ambiguity aversion when an investor has a prior degree of belief in the domestic capital asset pricing model (CAPM). Different from a Bayesian approach, the investor separately relies on the conditional distribution of returns and on the posterior over parameters to make decisions, rather than on the predictive distribution of returns that integrates priors and likelihood information. We find that in the perspective of U.S. investors, ambiguity aversion generates strong home bias in equity holdings, regardless of beliefs in the CAPM or risk aversion. Results become stronger under regime-switching investment opportunities.

Type
Research Article
Information
Journal of Financial and Quantitative Analysis , Volume 51 , Issue 4 , August 2016 , pp. 1297 - 1323
Copyright
Copyright © Michael G. Foster School of Business, University of Washington 2016 

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