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Foundations of ambiguity models under symmetry: α-MEU and smooth ambiguity

Author

Listed:
  • Peter Klibanoff

    (Northwestern University)

  • Sujoy Mukerji

    (Queen Mary University of London)

  • Kyoungwon Seo

    (Seoul National University)

  • Lorenzo Staca

    (Northwestern University)

Abstract

The α-MEU model and the smooth ambiguity model are two popular models in decision making under ambiguity. However, the axiomatic foundations of these two models are not completely understood. We provide axiomatic foundations of these models in a symmetric setting with a product state space . This setting allows marginals over S to be linked behaviorally with (limiting frequency) events. Bets on such events are shown to reveal the i.i.d. measures that are relevant for the decision maker's preferences and appear in the representations. By characterizing both models within a common framework, it becomes possible to better compare and relate them.

Suggested Citation

  • Peter Klibanoff & Sujoy Mukerji & Kyoungwon Seo & Lorenzo Staca, 2021. "Foundations of ambiguity models under symmetry: α-MEU and smooth ambiguity," Working Papers 922, Queen Mary University of London, School of Economics and Finance.
    • Handle: RePEc:qmw:qmwecw:922
    as

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    File URL: https://www.qmul.ac.uk/sef/media/econ/research/workingpapers/2021/wp922.pdf
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    References listed on IDEAS

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    More about this item

    Keywords

    Symmetry; beliefs; ambiguity; multiple priors; smooth ambiguity;
    All these keywords.

    JEL classification:

    • D01 - Microeconomics - - General - - - Microeconomic Behavior: Underlying Principles
    • D80 - Microeconomics - - Information, Knowledge, and Uncertainty - - - General
    • D81 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Criteria for Decision-Making under Risk and Uncertainty
    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness

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