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Signaling in a Global Game: Coordination and Policy Traps

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  • George-Marios Angeletos
  • Christian Hellwig
  • Alessandro Pavan

Abstract

This paper examines the ability of a policy maker to control equilibrium outcomes in a global coordination game; applications include currency attacks, bank runs, and debt crises. A unique equilibrium is known to survive when the policy is exogenously fixed. We show that, by conveying information, endogenous policy re-introduces multiple equilibria. Multiplicity obtains even in environments where the policy is observed with idiosyncratic noise. It is sustained by the agents coordinating on different interpretations of, and different reactions to, the same policy choices. The policy maker is thus trapped into a position where both the optimal policy and the coordination outcome are dictated by self-fulfilling market expectations.

Suggested Citation

  • George-Marios Angeletos & Christian Hellwig & Alessandro Pavan, 2005. "Signaling in a Global Game: Coordination and Policy Traps," Discussion Papers 1400, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
  • Handle: RePEc:nwu:cmsems:1400
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    References listed on IDEAS

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    More about this item

    Keywords

    global games; complementarities; signaling; self-fulfilling expectations; multiple equilibria; currency crises; regime change.;

    JEL classification:

    • C7 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory
    • D8 - Microeconomics - - Information, Knowledge, and Uncertainty
    • E5 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit
    • E6 - Macroeconomics and Monetary Economics - - Macroeconomic Policy, Macroeconomic Aspects of Public Finance, and General Outlook
    • F3 - International Economics - - International Finance

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