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Ambiguity in asset pricing and portfolio choice: a review of the literature

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  • Massimo Guidolin
  • Francesca Rinaldi

Abstract

A growing body of empirical evidence suggests that investors’ behavior is not well described by the traditional paradigm of (subjective) expected utility maximization under rational expectations. A literature has arisen that models agents whose choices are consistent with models that are less restrictive than the standard subjective expected utility framework. In this paper we conduct a survey of the existing literature that has explored the implications of decision-making under ambiguity for financial market outcomes, such as portfolio choice and equilibrium asset prices. We conclude that the ambiguity literature has led to a number of significant advances in our ability to rationalize empirical features of asset returns and portfolio decisions, such as the empirical failure of the two-fund separation theorem in portfolio decisions, the modest exposure to risky securities observed for a majority of investors, the home equity preference in international portfolio diversification, the excess volatility of asset returns, the equity premium and the risk-free rate puzzles, and the occurrence of trading break-downs.

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Paper provided by Federal Reserve Bank of St. Louis in its series Working Papers with number 2010-028.

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Date of creation: 2010
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Handle: RePEc:fip:fedlwp:2010-028

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Keywords: Capital assets pricing model ; Investments;

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Cited by:
  1. Pritsker, Matthew, 2013. "Knightian uncertainty and interbank lending," Journal of Financial Intermediation, Elsevier, vol. 22(1), pages 85-105.
  2. Caihua Chen & Xindan Li & Caleb Tolman & Suyang Wang & Yinyu Ye, 2013. "Sparse Portfolio Selection via Quasi-Norm Regularization," Papers 1312.6350, arXiv.org.
  3. Kast, Robert & Lapied, André & Roubaud, David, 2014. "Modelling under ambiguity with dynamically consistent Choquet random walks and Choquet–Brownian motions," Economic Modelling, Elsevier, vol. 38(C), pages 495-503.

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