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Contract (re-)negotiation with private and common values

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  • Gretschko, Vitali
  • Wambach, Achim

Abstract

We analyze the contracting problem of a principal who faces an agent with private information and cannot commit to not renegotiating a chosen contract. We model this by allowing the principal to propose new contracts any number of times after observing the contract choice of the agent. We propose a characterization of renegotiation-proof states of this (re-)negotiation and show that those states are supported by a perfect Bayesian equilibrium of an infinite horizon game. The characterization of renegotiation-proof states provides a tool, which is both powerful and simple to use, for finding such states in specific environments. We proceed by applying the results to adverse selection environments with private and common values. We show that with private values and common values of the "Spence" type only, fully efficient and separating states can be renegotiation-proof. With common values of the "Rothschild-Stiglitz" type inefficient and (partial) pooling states may be renegotiation-proof.

Suggested Citation

  • Gretschko, Vitali & Wambach, Achim, 2017. "Contract (re-)negotiation with private and common values," ZEW Discussion Papers 17-056, ZEW - Leibniz Centre for European Economic Research.
    • Handle: RePEc:zbw:zewdip:17056
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    References listed on IDEAS

    as
    1. Johannes Hörner & Larry Samuelson, 2011. "Managing Strategic Buyers," Journal of Political Economy, University of Chicago Press, vol. 119(3), pages 379-425.
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    6. Michael Rothschild & Joseph Stiglitz, 1976. "Equilibrium in Competitive Insurance Markets: An Essay on the Economics of Imperfect Information," The Quarterly Journal of Economics, President and Fellows of Harvard College, vol. 90(4), pages 629-649.
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    More about this item

    Keywords

    principal-agent models; renegotiation; Coase-conjecture;
    All these keywords.

    JEL classification:

    • C73 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Stochastic and Dynamic Games; Evolutionary Games
    • C78 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Bargaining Theory; Matching Theory
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design

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