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Robust Portfolio Rules and Asset Pricing

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Author Info
Pascal J. Maenhout
Abstract

I present a new approach to the dynamic portfolio and consumption problem of an investor who worries about model uncertainty (in addition to market risk) and seeks robust decisions along the lines of Anderson, Hansen, and Sargent (2002). In accordance with max-min expected utility, a robust investor insures against some endogenous worst case. I first show that robustness dramatically decreases the demand for equities and is observationally equivalent to recursive preferences when removing wealth effects. Unlike standard recursive preferences, however, robustness leads to environment-specific "effective" risk aversion. As an extension, I present a closed-form solution for the portfolio problem of a robust Duffie-Epstein-Zin investor. Finally, robustness increases the equilibrium equity premium and lowers the risk-free rate. Reasonable parameters generate a 4% to 6% equity premium. Copyright 2004, Oxford University Press.

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File URL: http://hdl.handle.net/10.1093/rfs/hhh003
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Publisher Info
Article provided by Oxford University Press for Society for Financial Studies in its journal The Review of Financial Studies.

Volume (Year): 17 (2004)
Issue (Month): 4 ()
Pages: 951-983
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Handle: RePEc:oup:rfinst:v:17:y:2004:i:4:p:951-983

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  1. Yulei Luo, 2006. "Rational Inattention, Portfolio Choice, and the Equity Premium," Computing in Economics and Finance 2006 56, Society for Computational Economics. [Downloadable!]
  2. Isaac Kleshchelski & Nicolas Vincent, 2007. "Robust Equilibrium Yield Curves," Cahiers de recherche 08-02, HEC Montréal, Institut d'économie appliquée. [Downloadable!]
  3. Marco Taboga, 2005. "Portfolio Selection with Two-Stage Preferences," Finance 0506009, EconWPA. [Downloadable!]
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  4. Patrick Gagliardini & Paolo Porchia & Fabio Trojani, 2007. "Ambiguity Aversion and the Term Structure of Interest Rates," University of St. Gallen Department of Economics working paper series 2007 2007-29, Department of Economics, University of St. Gallen. [Downloadable!]
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  5. Claudio Campanale, . "Learning, Ambiguity and Life-Cycle Portfolio Allocation," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics. [Downloadable!] (restricted)
  6. Larry Epstein & Martin Schneider, 2006. "Learning Under Ambiguity," RCER Working Papers 527, University of Rochester - Center for Economic Research (RCER). [Downloadable!]
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  7. Raghu Suryanarayanan, 2006. "Implications of Anticipated Regret and Endogenous Beliefs for Equilibrium Asset Prices: A Theoretical Framework," CSEF Working Papers 162, Centre for Studies in Economics and Finance (CSEF), University of Naples, Italy. [Downloadable!]
  8. Ju, Nengjiu & Miao, Jianjun, 2009. "Ambiguity, Learning, and Asset Returns," MPRA Paper 14737, University Library of Munich, Germany, revised Apr 2009. [Downloadable!]
  9. Stijn Van Nieuwerburgh & Laura Veldkamp, 2008. "Information Acquisition and Under-Diversification," NBER Working Papers 13904, National Bureau of Economic Research, Inc. [Downloadable!] (restricted)
  10. Oreste Tristani, 2007. "Model misspecification, the equilibrium natural interest rate and the equity premium," Working Paper Series 808, European Central Bank. [Downloadable!]
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  11. Kenneth Kasa, 2006. "Robustness and Information Processing," Review of Economic Dynamics, Elsevier for the Society for Economic Dynamics, vol. 9(1), pages 1-33, January. [Downloadable!] (restricted)
  12. Taboga, Marco, 2004. "A Simple Model of Robust Portfolio Selection," MPRA Paper 16472, University Library of Munich, Germany. [Downloadable!]
  13. Fabio Trojani & Markus Leippold & Paolo Vanini, 2005. "Learning and Asset Prices under Ambiguous Information," University of St. Gallen Department of Economics working paper series 2005 2005-03, Department of Economics, University of St. Gallen. [Downloadable!]
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