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Unintended hedging in ambiguity experiments

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  • Oechssler, Jörg
  • Roomets, Alex

Abstract

We describe an ambiguity hedging problem in Ellsberg experiments, where combinations of individually ambiguous bets eliminate aggregate ambiguity, and which may yield incorrect classifications of ambiguity averse subjects. We propose a new classification consistent with this hedging possibility.

Suggested Citation

  • Oechssler, Jörg & Roomets, Alex, 2014. "Unintended hedging in ambiguity experiments," Economics Letters, Elsevier, vol. 122(2), pages 243-246.
    • Handle: RePEc:eee:ecolet:v:122:y:2014:i:2:p:243-246
    DOI: 10.1016/j.econlet.2013.11.029
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    References listed on IDEAS

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    1. Ghirardato, Paolo & Maccheroni, Fabio & Marinacci, Massimo, 2004. "Differentiating ambiguity and ambiguity attitude," Journal of Economic Theory, Elsevier, vol. 118(2), pages 133-173, October.
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    5. Daniel Ellsberg, 1961. "Risk, Ambiguity, and the Savage Axioms," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 75(4), pages 643-669.
    6. Daniel Kahneman & Amos Tversky, 2013. "Prospect Theory: An Analysis of Decision Under Risk," World Scientific Book Chapters, in: Leonard C MacLean & William T Ziemba (ed.), HANDBOOK OF THE FUNDAMENTALS OF FINANCIAL DECISION MAKING Part I, chapter 6, pages 99-127, World Scientific Publishing Co. Pte. Ltd..
    7. Einhorn, Hillel J & Hogarth, Robin M, 1986. "Decision Making under Ambiguity," The Journal of Business, University of Chicago Press, vol. 59(4), pages 225-250, October.
    8. Yaron Azrieli & Christopher P. Chambers & Paul J. Healy, 2018. "Incentives in Experiments: A Theoretical Analysis," Journal of Political Economy, University of Chicago Press, vol. 126(4), pages 1472-1503.
    9. Gary Charness & Edi Karni & Dan Levin, 2013. "Ambiguity attitudes and social interactions: An experimental investigation," Journal of Risk and Uncertainty, Springer, vol. 46(1), pages 1-25, February.
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    Citations

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    Cited by:

    1. Aurélien Baillon & Yoram Halevy & Chen Li, 2022. "Experimental elicitation of ambiguity attitude using the random incentive system," Experimental Economics, Springer;Economic Science Association, vol. 25(3), pages 1002-1023, June.
    2. Alex Voorhoeve & Ken Binmore & Arnaldur Stefansson & Lisa Stewart, 2016. "Ambiguity attitudes, framing, and consistency," Theory and Decision, Springer, vol. 81(3), pages 313-337, September.
    3. Oechssler, Jörg & Roomets, Alex, 2023. "Dissolving an ambiguous partnership," Working Papers 0733, University of Heidelberg, Department of Economics.
    4. Konstantinos Georgalos, 2019. "An experimental test of the predictive power of dynamic ambiguity models," Journal of Risk and Uncertainty, Springer, vol. 59(1), pages 51-83, August.
    5. Christoph Kuzmics & Brian W. Rogers & Xiannong Zhang, 2024. "Randomization advice and ambiguity aversion," Journal of Risk and Uncertainty, Springer, vol. 69(1), pages 85-104, August.
    6. König-Kersting, Christian & Kops, Christopher & Trautmann, Stefan T., 2023. "A test of (weak) certainty independence," Journal of Economic Theory, Elsevier, vol. 209(C).
    7. Salmon, Timothy C. & Shniderman, Adam, 2019. "Ambiguity in criminal punishment," Journal of Economic Behavior & Organization, Elsevier, vol. 163(C), pages 361-376.
    8. Bade, Sophie, 2015. "Randomization devices and the elicitation of ambiguity-averse preferences," Journal of Economic Theory, Elsevier, vol. 159(PA), pages 221-235.
    9. Aurélien Baillon & Yoram Halevy & Chen Li, 2022. "Randomize at Your Own Risk: On the Observability of Ambiguity Aversion," Econometrica, Econometric Society, vol. 90(3), pages 1085-1107, May.
    10. Oechssler, Jörg & Rau, Hannes & Roomets, Alex, 2019. "Hedging, ambiguity, and the reversal of order axiom," Games and Economic Behavior, Elsevier, vol. 117(C), pages 380-387.
    11. Robin Cubitt & Gijs Kuilen & Sujoy Mukerji, 2018. "The strength of sensitivity to ambiguity," Theory and Decision, Springer, vol. 85(3), pages 275-302, October.
    12. Jörg Oechssler & Alex Roomets, 2021. "Savage vs. Anscombe-Aumann: an experimental investigation of ambiguity frameworks," Theory and Decision, Springer, vol. 90(3), pages 405-416, May.
    13. Roxane Bricet, 2018. "Preferences for information precision under ambiguity," Thema Working Papers 2018-09, THEMA (Théorie Economique, Modélisation et Applications), CY Cergy-Paris University, ESSEC and CNRS.
    14. Baillon, Aurélien & Placido, Lætitia, 2019. "Testing constant absolute and relative ambiguity aversion," Journal of Economic Theory, Elsevier, vol. 181(C), pages 309-332.
    15. repec:awi:wpaper:621 is not listed on IDEAS
    16. Kops, Christopher & Pasichnichenko, Illia, 2023. "Testing negative value of information and ambiguity aversion," Journal of Economic Theory, Elsevier, vol. 213(C).
    17. Oechssler, Jörg & Rau, Hannes & Roomets, Alex, 2016. "Hedging and Ambiguity," Working Papers 0621, University of Heidelberg, Department of Economics.
    18. Aurélien Baillon & Harris Schlesinger & Gijs van de Kuilen, 2018. "Measuring higher order ambiguity preferences," Experimental Economics, Springer;Economic Science Association, vol. 21(2), pages 233-256, June.
    19. Brown, Alexander L. & Healy, Paul J., 2018. "Separated decisions," European Economic Review, Elsevier, vol. 101(C), pages 20-34.
    20. Florian H. Schneider & Martin Schonger, 2019. "An Experimental Test of the Anscombe–Aumann Monotonicity Axiom," Management Science, INFORMS, vol. 65(4), pages 1667-1677, April.
    21. Cathleen Johnson & Aurélien Baillon & Han Bleichrodt & Zhihua Li & Dennie Dolder & Peter P. Wakker, 2021. "Prince: An improved method for measuring incentivized preferences," Journal of Risk and Uncertainty, Springer, vol. 62(1), pages 1-28, February.
    22. Cettolin, Elena & Riedl, Arno, 2019. "Revealed preferences under uncertainty: Incomplete preferences and preferences for randomization," Journal of Economic Theory, Elsevier, vol. 181(C), pages 547-585.
    23. Oechssler, Jörg & Roomets, Alex, 2015. "A test of mechanical ambiguity," Journal of Economic Behavior & Organization, Elsevier, vol. 119(C), pages 153-162.
    24. Voorhoeve, Alex & Binmore, Ken G & Stefansson, Arnaldur & Stewart, Lisa, 2016. "Ambiguity attitudes, framing, and consistency," LSE Research Online Documents on Economics 65577, London School of Economics and Political Science, LSE Library.
    25. Tomohito Aoyama & Nobuyuki Hanaki, 2024. "Experimental Evaluation of Random Incentive System under Ambiguity," ISER Discussion Paper 1236rr, Institute of Social and Economic Research, The University of Osaka, revised Sep 2025.

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    JEL classification:

    • C91 - Mathematical and Quantitative Methods - - Design of Experiments - - - Laboratory, Individual Behavior
    • D81 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Criteria for Decision-Making under Risk and Uncertainty

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