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Ambiguity, Optimism, and Pessimism in Adverse Selection Models

Author

Listed:
  • Raphaël Giraud

    (LED - Laboratoire d'Economie Dionysien - UP8 - Université Paris 8)

  • Lionel Thomas

    (CRESE - Centre de REcherches sur les Stratégies Economiques (UR 3190) - UFC - Université de Franche-Comté - UBFC - Université Bourgogne Franche-Comté [COMUE])

Abstract

We investigate the effect of ambiguity and ambiguity attitude on the shape and properties of the optimal contract in an adverse selection model with a continuum of types, using the parametric model of ambiguity and ambiguity aversion called the NEO-additive model (Chateauneuf, Eichberger, and Grant, 2007). We show that it necessarily features efficiency and a jump at the top and pooling at the bottom of the distribution. Conditional on the degree of ambiguity, the pooling section may or may not be supplemented by a separating section. As a result, ambiguity adversely affects the principal's ability to solve the adverse selection problem and therefore the least efficient types benefit from ambiguity with respect to risk. Conversely, ambiguity is detrimental to the most efficient types. This is confirmed in the comparative statics section.
(This abstract was borrowed from another version of this item.)

Suggested Citation

  • Raphaël Giraud & Lionel Thomas, 2017. "Ambiguity, Optimism, and Pessimism in Adverse Selection Models," Post-Print hal-02878106, HAL.
    • Handle: RePEc:hal:journl:hal-02878106
    DOI: 10.1016/j.jet.2017.06.004
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    Cited by:

    1. Li, Wenhui & Wilde, Christian, 2020. "Belief formation and belief updating under ambiguity: Evidence from experiments," SAFE Working Paper Series 251, Leibniz Institute for Financial Research SAFE, revised 2020.
    2. Daiki Kishishita & Susumu Sato, 2021. "Optimal risk regulation of monopolists with subjective risk assessment," Journal of Regulatory Economics, Springer, vol. 59(3), pages 251-279, June.
    3. Joaquín Gómez Miñambres & Mark Schneider, 2019. "Carrots and Sticks: Optimal Contracting with Skewness Preference and Ambiguity Aversion," Working Papers 19-02, Chapman University, Economic Science Institute.
    4. Gao, Yongling & Driouchi, Tarik & Bennett, David J., 2018. "Ambiguity aversion in buyer-seller relationships: A contingent-claims and social network explanation," International Journal of Production Economics, Elsevier, vol. 200(C), pages 50-67.
    5. Pascal Toquebeuf, 2025. "Dynamic adverse selection with the best and the worst in mind," Post-Print hal-05407714, HAL.
    6. Zheng, Shiyuan & Wang, Kun & Chan, Felix T.S. & Fu, Xiaowen & Li, Zhi-Chun, 2022. "Subsidy on transport adaptation investment-modeling decisions under incomplete information and ambiguity," Transportation Research Part B: Methodological, Elsevier, vol. 162(C), pages 103-129.

    More about this item

    JEL classification:

    • D81 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Criteria for Decision-Making under Risk and Uncertainty
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design

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