# Are Universal Preferences Possible? Calibration Results for Non-Expected Utility Theories

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## Abstract

## Suggested Citation

**Are Universal Preferences Possible? Calibration Results for Non-Expected Utility Theories**," Boston College Working Papers in Economics 633, Boston College Department of Economics.

*RePEc:boc:bocoec:633*

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## References listed on IDEAS

- Yoram Halevy & Vincent Feltkamp, 2005.
"
**A Bayesian Approach to Uncertainty Aversion**," Review of Economic Studies, Oxford University Press, vol. 72(2), pages 449-466.- Yoram Halevy & Vincent Feltkamp, "undated".
"
**A Bayesian Approach to Uncentainty Aversion**," CARESS Working Papres 99-03, University of Pennsylvania Center for Analytic Research and Economics in the Social Sciences. - Vincent Feltkamp & Yoram Halevy, 1999.
"
**- A Bayesian Approach To Uncertainty Aversion**," Working Papers. Serie AD 1999-14, Instituto Valenciano de Investigaciones Económicas, S.A. (Ivie). - Yoram Halevy & Vincent Feltkamp, "undated".
"
**A Bayesian Approach to Uncentainty Aversion**," Penn CARESS Working Papers f17f3e2c6ad93e4b53fd58fc9, Penn Economics Department. - Vincent Feltkamp & Yoram Halevy, 2000.
"
**A Bayesian Approach to Uncertainty Aversion**," Econometric Society World Congress 2000 Contributed Papers 1125, Econometric Society. - Feltkamp, Vincent & Halevy, Yoram, 2004.
"
**A Bayesian Approach to Uncertainty Aversion**," Microeconomics.ca working papers halevy-04-02-13-07-48-37, Vancouver School of Economics, revised 25 Feb 2014.

- Yoram Halevy & Vincent Feltkamp, "undated".
"
- Segal, Uzi, 1990.
"
**Two-Stage Lotteries without the Reduction Axiom**," Econometrica, Econometric Society, vol. 58(2), pages 349-377, March.- Uzi Segal, 1989.
"
**Two-Stage Lotteries Without the Reduction Axiom**," UCLA Economics Working Papers 552, UCLA Department of Economics. - Uzi Segal, 2000.
"
**Two Stage Lotteries Without the Reduction Axiom**," Levine's Working Paper Archive 7599, David K. Levine.

- Uzi Segal, 1989.
"
- Yaari, Menahem E, 1987.
"
**The Dual Theory of Choice under Risk**," Econometrica, Econometric Society, vol. 55(1), pages 95-115, January. - Epstein, Larry G. & Zin, Stanley E., 1990.
"
**'First-order' risk aversion and the equity premium puzzle**," Journal of Monetary Economics, Elsevier, vol. 26(3), pages 387-407, December.- L. Epstein & S. Zin, 2010.
"
**First order risk aversion and the equity premium puzzle**," Levine's Working Paper Archive 1400, David K. Levine.

- L. Epstein & S. Zin, 2010.
"
- Tversky, Amos & Kahneman, Daniel, 1992.
"
**Advances in Prospect Theory: Cumulative Representation of Uncertainty**," Journal of Risk and Uncertainty, Springer, vol. 5(4), pages 297-323, October. - Hong, Chew Soo & Karni, Edi & Safra, Zvi, 1987.
"
**Risk aversion in the theory of expected utility with rank dependent probabilities**," Journal of Economic Theory, Elsevier, vol. 42(2), pages 370-381, August. - Ariel Rubinstein, 2006.
"
**Dilemmas of an Economic Theorist**," Econometrica, Econometric Society, vol. 74(4), pages 865-883, July.- Ariel Rubinstein, 2004.
"
**Dilemmas of An Economic Theorist**," Econometric Society 2004 Australasian Meetings 354, Econometric Society. - Ariel Rubinstein, 2004.
"
**Dilemmas of an Economic Theorist**," Econometric Society 2004 North American Summer Meetings 661, Econometric Society.

- Ariel Rubinstein, 2004.
"
- Weymark, John A., 1981.
"
**Generalized gini inequality indices**," Mathematical Social Sciences, Elsevier, vol. 1(4), pages 409-430, August.- WEYMARK, John A., 1981.
"
**Generalized Gini inequality indices**," LIDAM Reprints CORE 453, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).

- WEYMARK, John A., 1981.
"
- Haluk Ergin & Faruk Gul, 2003.
"
**A Subjective Theory of Compound Lotteries**," Levine's Bibliography 506439000000000406, UCLA Department of Economics. - Quiggin, John, 1982.
"
**A theory of anticipated utility**," Journal of Economic Behavior & Organization, Elsevier, vol. 3(4), pages 323-343, December. - Gilboa, Itzhak, 1987.
"
**Expected utility with purely subjective non-additive probabilities**," Journal of Mathematical Economics, Elsevier, vol. 16(1), pages 65-88, February.- Gilboa, Itzhak, 1985.
"
**Expected Utility with Purely Subjective Non-Additive Probabilities**," Foerder Institute for Economic Research Working Papers 275389, Tel-Aviv University > Foerder Institute for Economic Research. - Itzhak Gilboa, 1987.
"
**Expected Utility with Purely Subjective Non-Additive Probabilities**," Post-Print hal-00756291, HAL.

- Gilboa, Itzhak, 1985.
"
- Segal, Uzi, 1987.
"
**The Ellsberg Paradox and Risk Aversion: An Anticipated Utility Approach**," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 28(1), pages 175-202, February.- Uzi Segal, 1985.
"
**The Ellsberg Paradox and Risk Aversion: An Anticipated Utility Approach**," UCLA Economics Working Papers 362, UCLA Department of Economics.

- Uzi Segal, 1985.
"
- Luigi Guiso & Monica Paiella, 2008.
"
**Risk Aversion, Wealth, and Background Risk**," Journal of the European Economic Association, MIT Press, vol. 6(6), pages 1109-1150, December.- Guiso, Luigi & Pagel, Michaela, 2001.
"
**Risk Aversion, Wealth and Background Risk**," CEPR Discussion Papers 2728, C.E.P.R. Discussion Papers. - Monica Paiella & Luigi Guiso, 2004.
"
**Risk Aversion, Wealth and Background Risk**," 2004 Meeting Papers 525, Society for Economic Dynamics. - Luigi Guiso & Monica Paiella, 2007.
"
**Risk Aversion, Wealth, and Background Risk**," Economics Working Papers ECO2007/47, European University Institute. - Luigi Guiso & Monica Paiella, 2003.
"
**Risk Aversion, Wealth and Background Risk**," Temi di discussione (Economic working papers) 483, Bank of Italy, Economic Research and International Relations Area.

- Guiso, Luigi & Pagel, Michaela, 2001.
"
- Gul, Faruk, 1991.
"
**A Theory of Disappointment Aversion**," Econometrica, Econometric Society, vol. 59(3), pages 667-686, May. - Kahneman, Daniel & Tversky, Amos, 1979.
"
**Prospect Theory: An Analysis of Decision under Risk**," Econometrica, Econometric Society, vol. 47(2), pages 263-291, March.- Amos Tversky & Daniel Kahneman, 1979.
"
**Prospect Theory: An Analysis of Decision under Risk**," Levine's Working Paper Archive 7656, David K. Levine.

- Amos Tversky & Daniel Kahneman, 1979.
"
- Karni, Edi & Safra, Zvi, 1990.
"
**Rank-Dependent Probabilities**," Economic Journal, Royal Economic Society, vol. 100(401), pages 487-495, June.- Karni, E. & Safra, Z., 1988.
"
**Rank-Dependent Probabilities**," Papers 11-88, Tel Aviv.

- Karni, E. & Safra, Z., 1988.
"
- Schmeidler, David, 1989.
"
**Subjective Probability and Expected Utility without Additivity**," Econometrica, Econometric Society, vol. 57(3), pages 571-587, May.- David Schmeidler, 1989.
"
**Subjective Probability and Expected Utility without Additivity**," Levine's Working Paper Archive 7662, David K. Levine.

- David Schmeidler, 1989.
"
- Peter Klibanoff & Massimo Marinacci & Sujoy Mukerji, 2005.
"
**A Smooth Model of Decision Making under Ambiguity**," Econometrica, Econometric Society, vol. 73(6), pages 1849-1892, November.- Peter Klibanoff & Massimo Marinacci & Sujoy Mukerji, 2002.
"
**A smooth model of decision making under ambiguity**," ICER Working Papers - Applied Mathematics Series 11-2003, ICER - International Centre for Economic Research, revised Apr 2003. - Sujoy Mukerji & Peter Klibanoff & Northwesern University Massimo Marinacci & Dip. di Satistic e Matematica Applicata & Universita di Torino and ICER, 2002.
"
**A Smooth Model of Decision,Making Under Ambiguity**," Economics Series Working Papers 113, University of Oxford, Department of Economics.

- Peter Klibanoff & Massimo Marinacci & Sujoy Mukerji, 2002.
"
- William Neilson, 2001.
"
**Calibration results for rank-dependent expected utility**," Economics Bulletin, AccessEcon, vol. 4(10), pages 1-5. - Gilboa, Itzhak & Schmeidler, David, 1989.
"
**Maxmin expected utility with non-unique prior**," Journal of Mathematical Economics, Elsevier, vol. 18(2), pages 141-153, April.- Gilboa, Itzhak & Schmeidler, David, 1986.
"
**Maxmin Expected Utility with a Non-Unique Prior**," Foerder Institute for Economic Research Working Papers 275405, Tel-Aviv University > Foerder Institute for Economic Research. - Itzhak Gilboa & David Schmeidler, 1989.
"
**Maxmin Expected Utility with Non-Unique Prior**," Post-Print hal-00753237, HAL.

- Gilboa, Itzhak & Schmeidler, David, 1986.
"
- Border, Kim C. & Ghirardato, Paolo & Segal, Uzi, 2005.
"
**Objective subjective probabilities**," Working Papers 1228, California Institute of Technology, Division of the Humanities and Social Sciences.- Kim C. Border & Paolo Ghirardato & Uzi Segal, 2005.
"
**Objective Subjective Probabilities**," Boston College Working Papers in Economics 616, Boston College Department of Economics, revised 07 Dec 2005.

- Kim C. Border & Paolo Ghirardato & Uzi Segal, 2005.
"
- Mark Machina, 2004.
"
**Almost-objective uncertainty**," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 24(1), pages 1-54, July.- Machina, Mark J, 2001.
"
**Almost-Objective Uncertainty**," University of California at San Diego, Economics Working Paper Series qt3ps1k85f, Department of Economics, UC San Diego.

- Machina, Mark J, 2001.
"
- Chew, Soo Hong, 1983.
"
**A Generalization of the Quasilinear Mean with Applications to the Measurement of Income Inequality and Decision Theory Resolving the Allais Paradox**," Econometrica, Econometric Society, vol. 51(4), pages 1065-1092, July. - Cox, James C. & Sadiraj, Vjollca, 2006.
"
**Small- and large-stakes risk aversion: Implications of concavity calibration for decision theory**," Games and Economic Behavior, Elsevier, vol. 56(1), pages 45-60, July.- James C. Cox & Vjollca Sadiraj, 2007.
"
**Small- and Large-Stakes Risk Aversion: Implications of Concavity Calibration for Decision Theory**," Experimental Economics Center Working Paper Series 2006-03, Experimental Economics Center, Andrew Young School of Policy Studies, Georgia State University.

- James C. Cox & Vjollca Sadiraj, 2007.
"
- Palacios-Huerta, Ignacio & Serrano, Roberto, 2006.
"
**Rejecting small gambles under expected utility**," Economics Letters, Elsevier, vol. 91(2), pages 250-259, May.- Ignacio Palacios-Huerta & Roberto Serrano & Oscar Volij, 2003.
"
**Rejecting Small Gambles Under Expected Utility**," Economics Working Papers 0032, Institute for Advanced Study, School of Social Science.

- Ignacio Palacios-Huerta & Roberto Serrano & Oscar Volij, 2003.
"
- Conlisk, John, 1989.
"
**Three Variants on the Allais Example**," American Economic Review, American Economic Association, vol. 79(3), pages 392-407, June. - Segal, Uzi & Spivak, Avia, 1990.
"
**First order versus second order risk aversion**," Journal of Economic Theory, Elsevier, vol. 51(1), pages 111-125, June.- Uzi Segal & Avia Spivak, 1988.
"
**First Order Versus Second Order Risk Aversion**," UCLA Economics Working Papers 540, UCLA Department of Economics.

- Uzi Segal & Avia Spivak, 1988.
"
- Fishburn, Peter C., 1983.
"
**Transitive measurable utility**," Journal of Economic Theory, Elsevier, vol. 31(2), pages 293-317, December. - Chris Starmer, 2000.
"
**Developments in Non-expected Utility Theory: The Hunt for a Descriptive Theory of Choice under Risk**," Journal of Economic Literature, American Economic Association, vol. 38(2), pages 332-382, June. - Larry G. Epstein, 1999.
"
**A Definition of Uncertainty Aversion**," Review of Economic Studies, Oxford University Press, vol. 66(3), pages 579-608. - Chew, S H & Epstein, Larry G & Segal, U, 1991.
"
**Mixture Symmetry and Quadratic Utility**," Econometrica, Econometric Society, vol. 59(1), pages 139-163, January. - Machina, Mark J, 1982.
"
**"Expected Utility" Analysis without the Independence Axiom**," Econometrica, Econometric Society, vol. 50(2), pages 277-323, March.- Mark J Machina, 1982.
"
**"Expected Utility" Analysis without the Independence Axiom**," Levine's Working Paper Archive 7650, David K. Levine.

- Mark J Machina, 1982.
"
- Rothschild, Michael & Stiglitz, Joseph E., 1970.
"
**Increasing risk: I. A definition**," Journal of Economic Theory, Elsevier, vol. 2(3), pages 225-243, September. - Machina, Mark J, 1987.
"
**Choice under Uncertainty: Problems Solved and Unsolved**," Journal of Economic Perspectives, American Economic Association, vol. 1(1), pages 121-154, Summer. - Battalio, Raymond C & Kagel, John H & Jiranyakul, Komain, 1990.
"
**Testing between Alternative Models of Choice under Uncertainty: Some Initial Results**," Journal of Risk and Uncertainty, Springer, vol. 3(1), pages 25-50, March. - Kreps, David M & Porteus, Evan L, 1978.
"
**Temporal Resolution of Uncertainty and Dynamic Choice Theory**," Econometrica, Econometric Society, vol. 46(1), pages 185-200, January.- David M Kreps & Evan L Porteus, 1978.
"
**Temporal Resolution of Uncertainty and Dynamic Choice Theory**," Levine's Working Paper Archive 625018000000000009, David K. Levine.

- David M Kreps & Evan L Porteus, 1978.
"
- Dekel, Eddie, 1986.
"
**An axiomatic characterization of preferences under uncertainty: Weakening the independence axiom**," Journal of Economic Theory, Elsevier, vol. 40(2), pages 304-318, December.

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Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
**Cited by:**

- Zvi Safra & Uzi Segal, 2008.
"
**Calibration Results for Non-Expected Utility Theories**," Econometrica, Econometric Society, vol. 76(5), pages 1143-1166, September.- Zvi Safra & Uzi Segal, 2006.
"
**Calibration Results for Non-Expected Utility Theories**," Boston College Working Papers in Economics 645, Boston College Department of Economics. - Zvi Safra & Uzi Segal, 2008.
"
**Calibration Results for Non-Expected Utility Theories**," Boston College Working Papers in Economics 682, Boston College Department of Economics.

- Zvi Safra & Uzi Segal, 2006.
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- Daijiro Kawanaka, 2023.
"
**Mixture Attitudes of Expectation-Based Loss Aversion**," Discussion Papers in Economics and Business 23-02, Osaka University, Graduate School of Economics.

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## More about this item

### NEP fields

This paper has been announced in the following NEP Reports:- NEP-CBE-2006-08-05 (Cognitive & Behavioural Economics)
- NEP-UPT-2006-08-05 (Utility Models & Prospect Theory)

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