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How cheap talk enhances efficiency in threshold public goods games

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  • Palfrey, Thomas
  • Rosenthal, Howard
  • Roy, Nilanjan

Abstract

This paper uses a Bayesian mechanism design approach to investigate the effects of communication in a threshold public goods game. Individuals have private information about contribution costs. Individuals can each make a discrete contribution. If the number of contributors is at least equal to the threshold, a public benefit accrues to all members of the group. We experimentally implement three different communication structures prior to the decision move: (a) simultaneous exchange of binary messages, (b) larger finite numerical message space and (c) unrestricted text chat. We obtain theoretical bounds on the efficiency gains that are obtainable under these different communication structures. In an experiment with three person groups and a threshold of two, we observe significant efficiency gains only with the richest of these communication structures, where participants engage in unrestricted text chatting. In that case, the efficiency bounds implied by mechanism design theory are achieved.

Suggested Citation

  • Palfrey, Thomas & Rosenthal, Howard & Roy, Nilanjan, 2017. "How cheap talk enhances efficiency in threshold public goods games," Games and Economic Behavior, Elsevier, vol. 101(C), pages 234-259.
    • Handle: RePEc:eee:gamebe:v:101:y:2017:i:c:p:234-259
    DOI: 10.1016/j.geb.2015.10.004
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    More about this item

    Keywords

    Communication; Cheap talk; Message space; Public good provision;
    All these keywords.

    JEL classification:

    • C72 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Noncooperative Games
    • C92 - Mathematical and Quantitative Methods - - Design of Experiments - - - Laboratory, Group Behavior
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness
    • H41 - Public Economics - - Publicly Provided Goods - - - Public Goods

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