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Cheap Talk by Two Senders in the Presence of Network Externalities

Author

Listed:
  • Jeahan Jung

    (POSTECH)

  • Jeong-Yoo Kim

    (Kyung Hee University)

Abstract

We develop a model of cheap talk with two senders in the presence of network externalities, such that their utility functions are increasing in the network size. We first show that, if there is no noise in the private information received by each sender, the full information is revealed by the harshest cross-checking strategies, that is, strategies to punish the senders unless their messages exactly coincide. Then, we prove that, even with a small noise, cross-checking strategies cannot induce full revelation if the utility functions of senders are linear in the network size, whereas full revelation is possible if utility functions are strictly concave. Finally, we show that a CARA (constant absolute risk aversion) utility function of senders is the necessary and sufficient condition for the existence of a fully revealing equilibrium, which is supported by the cross-checking strategy with a positive confidence interval independent of each sender’s private information.

Suggested Citation

  • Jeahan Jung & Jeong-Yoo Kim, 2019. "Cheap Talk by Two Senders in the Presence of Network Externalities," Korean Economic Review, Korean Economic Association, vol. 35, pages 249-274.
    • Handle: RePEc:kea:keappr:ker-20190101-35-1-09
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    References listed on IDEAS

    as
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    Cited by:

    1. Jeong-Yoo Kim, 2023. "Proposing New Equilibrium Concepts in Dynamic Games with Noisy Signals," Korean Economic Review, Korean Economic Association, vol. 39, pages 413-443.

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    More about this item

    Keywords

    Cheap Talk; Cross-checking Strategy; Fully Revealing Equilibrium; Network Externality; Word-of-mouth Communication;
    All these keywords.

    JEL classification:

    • C7 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory
    • D8 - Microeconomics - - Information, Knowledge, and Uncertainty

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