Ambiguity in Asset Markets: Theory and Experiment
This paper studies the impact of ambiguity and ambiguity aversion on equilibrium asset prices and portfolio holdings in competitive financial markets. It argues that attitudes toward ambiguity are heterogeneous across the population, just as attitudes toward risk are heterogeneous across the population, but that heterogeneity of attitudes toward ambiguity has different implications than heterogeneity of attitudes toward risk. In particular, when some state probabilities are not known, agents who are sufficiently ambiguity averse find open sets of prices for which they refuse to hold an ambiguous portfolio. This suggests a different cross-section of portfolio choices, a wider range of state price/probability ratios and different rankings of state price/probability ratios than would be predicted if state probabilities were known. Experiments confirm all of these suggestions. Our findings contradict the claim that investors who have cognitive biases do not affect prices because they are infra-marginal: ambiguity averse investors have an indirect effect on prices because they change the per-capita amount of risk that is to be shared among the marginal investors. Our experimental data also suggest a positive correlation between risk aversion and ambiguity aversion that might explain the "value effect" in historical data.
|Date of creation:||2006|
|Date of revision:||2009|
|Contact details of provider:|| Postal: Via Real Collegio, 30, 10024 Moncalieri (To)|
Web page: http://www.carloalberto.org/
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- Rose-Anne Dana, 2004. "Ambiguity, uncertainty aversion and equilibrium welfare," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 23(3), pages 569-587, March.
- Larry G. Epstein & JianJun Miao, 2001.
"A Two-Person Dynamic Equilibrium under Ambiguity,"
RCER Working Papers
478, University of Rochester - Center for Economic Research (RCER).
- Gneezy, U. & Kapteyn, A. & Potters, J.J.M., 2002.
"Evaluation Periods and Asset Prices in a Market Experiment,"
2002-8, Tilburg University, Center for Economic Research.
- Uri Gneezy & Arie Kapteyn & Jan Potters, 2003. "Evaluation Periods and Asset Prices in a Market Experiment," Journal of Finance, American Finance Association, vol. 58(2), pages 821-838, 04.
- Uri Gneezy & Arie Kapteyn & Jan Potters, 2002. "Evaluation Periods and Assett Prices in a Market Experiment," Working Papers 02-02, RAND Corporation.
- Fama, Eugene F & French, Kenneth R, 1992. " The Cross-Section of Expected Stock Returns," Journal of Finance, American Finance Association, vol. 47(2), pages 427-465, June.
- Brian D. Kluger & Steve B. Wyatt, 2004. "Are Judgment Errors Reflected in Market Prices and Allocations? Experimental Evidence Based on the Monty Hall Problem," Journal of Finance, American Finance Association, vol. 59(3), pages 969-998, 06.
- repec:dau:papers:123456789/5393 is not listed on IDEAS
- Peter Bossaerts & Charles Plott, 2004.
"Basic Principles of Asset Pricing Theory: Evidence from Large-Scale Experimental Financial Markets,"
Review of Finance,
European Finance Association, vol. 8(2), pages 135-169.
- Peter Bossaerts & Charles Plott, 2004. "Basic Principles of Asset Pricing Theory: Evidence from Large-Scale Experimental Financial Markets," Review of Finance, Springer, vol. 8(2), pages 135-169.
- Bossaerts, Peter & Plott, Charles, 2000. "Basic Principles Of Asset Pricing Theory: Evidence From Large-Scale Experimental Financial Markets," CEPR Discussion Papers 2578, C.E.P.R. Discussion Papers.
- Bossaerts, Peter & Plott, Charles R., 2000. "Basic Principles of Asset Pricing Theory: Evidence From Large-Scale Experimental Financial Markets," Working Papers 1070, California Institute of Technology, Division of the Humanities and Social Sciences.
- Marco Cagetti & Lars Peter Hansen & Thomas Sargent & Noah Williams, 2002. "Robustness and Pricing with Uncertain Growth," Review of Financial Studies, Society for Financial Studies, vol. 15(2), pages 363-404, March.
- Epstein, Larry G & Wang, Tan, 1994. "Intertemporal Asset Pricing Under Knightian Uncertainty," Econometrica, Econometric Society, vol. 62(2), pages 283-322, March.
- Peter Bossaerts & Charles Plott & William R. Zame, 2005.
"Prices and Portfolio Choices in Financial Markets: Theory and Experiments,"
UCLA Economics Working Papers
840, UCLA Department of Economics.
- Peter Bossaerts & Charles Plott & William R. Zame, 2006. "Prices and Portfolio Choices in Financial Markets: Theory and Experiment," Levine's Bibliography 122247000000001322, UCLA Department of Economics.
- Raman Uppal & Tan Wang, 2003.
"Model Misspecification and Underdiversification,"
Journal of Finance,
American Finance Association, vol. 58(6), pages 2465-2486, December.
- Ghirardato, Paolo & Maccheroni, Fabio & Marinacci, Massimo, 2004. "Differentiating ambiguity and ambiguity attitude," Journal of Economic Theory, Elsevier, vol. 118(2), pages 133-173, October.
- Itzhak Gilboa & David Schmeidler, 1989.
"Maxmin Expected Utility with Non-Unique Prior,"
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