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On the value of persuasion by experts

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  • Alonso, Ricardo
  • Câmara, Odilon

Abstract

We consider a persuasion model in which a sender influences the actions of a receiver by selecting an experiment (public signal) from a set of feasible experiments. We ask: does the sender benefit from becoming an expert — observing a private signal prior to her selection? We provide necessary and sufficient conditions for a sender to never gain by becoming informed. Our key condition (sequential redundancy) shows that the informativeness of public experiments can substitute for the sender's expertise. We then provide conditions for private information to strictly benefit or strictly hurt the sender. Expertise is beneficial when the sender values the ability to change her experimental choice according to her private information. When the sender does not gain from expertise, she is strictly hurt when different types cannot pool on an optimal experiment.

Suggested Citation

  • Alonso, Ricardo & Câmara, Odilon, 2018. "On the value of persuasion by experts," Journal of Economic Theory, Elsevier, vol. 174(C), pages 103-123.
    • Handle: RePEc:eee:jetheo:v:174:y:2018:i:c:p:103-123
    DOI: 10.1016/j.jet.2017.12.001
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    References listed on IDEAS

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    Cited by:

    1. Shaofei Jiang, 2024. "Costly Persuasion by a Partially Informed Sender," Papers 2401.14087, arXiv.org, revised Feb 2024.
    2. Jonas Hedlund & T. Florian Kauffeldt & Malte Lammert, 2021. "Persuasion under ambiguity," Theory and Decision, Springer, vol. 90(3), pages 455-482, May.
    3. Andriy Zapechelnyuk, 2023. "On the equivalence of information design by uninformed and informed principals," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 76(4), pages 1051-1067, November.
    4. Martin Richardson, 2021. "Of hired guns and ideologues: why would a law firm ever retain an honest expert witness?," ANU Working Papers in Economics and Econometrics 2021-678, Australian National University, College of Business and Economics, School of Economics.
    5. Chan, Jimmy & Gupta, Seher & Li, Fei & Wang, Yun, 2019. "Pivotal persuasion," Journal of Economic Theory, Elsevier, vol. 180(C), pages 178-202.
      • Jimmy Chan & Seher Gupta & Fei Li & Yun Wang, 2018. "Pivotal Persuasion," Working Papers 2018-11-03, Wang Yanan Institute for Studies in Economics (WISE), Xiamen University.
    6. Bizzotto, Jacopo & Rüdiger, Jesper & Vigier, Adrien, 2020. "Testing, disclosure and approval," Journal of Economic Theory, Elsevier, vol. 187(C).
    7. Roy, Jaideep & Silvers, Randy & Sun, Ching-Jen, 2019. "Majoritarian preference, utilitarian welfare and public information in Cournot oligopoly," Games and Economic Behavior, Elsevier, vol. 116(C), pages 269-288.
    8. Arianna Degan & Ming Li, 2021. "Persuasion with costly precision," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 72(3), pages 869-908, October.
    9. Kerman, Toygar & Herings, P. Jean-Jacques & Karos, Dominik, 2020. "Persuading Strategic Voters," Research Memorandum 004, Maastricht University, Graduate School of Business and Economics (GSBE).
    10. Hedlund, Jonas, 2014. "Bayesian signaling," Working Papers 0577, University of Heidelberg, Department of Economics.
    11. Yanlin Chen & Jun Zhang, 2019. "Signaling by Bayesian Persuasion and Pricing Strategy. Short title: Disclosure and Price Signaling," Working Paper Series 2019/14, Economics Discipline Group, UTS Business School, University of Technology, Sydney.

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    More about this item

    Keywords

    Information design; Bayesian persuasion; Experts;
    All these keywords.

    JEL classification:

    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness

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