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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 introduces signaling in a global game so as to examine the informational role of policy in coordination environments such as currency crises and bank runs. While exogenous asymmetric information has been shown to select a unique equilibrium, we show that the endogenous information generated by policy interventions leads to multiple equilibria. The policy maker is thus trapped into a position in which self-fulfilling expectations dictate not only the coordination outcome but also the optimal policy. This result does not rely on the freedom to choose out-of-equilibrium beliefs, nor on the policy being a public signal; it may obtain even if the policy is observed with idiosyncratic noise.

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Bibliographic Info

Article provided by University of Chicago Press in its journal Journal of Political Economy.

Volume (Year): 114 (2006)
Issue (Month): 3 (June)
Pages: 452-484

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Handle: RePEc:ucp:jpolec:v:114:y:2006:i:3:p:452-484

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  1. Hellwig, Christian, 2002. "Public Information, Private Information, and the Multiplicity of Equilibria in Coordination Games," Journal of Economic Theory, Elsevier, vol. 107(2), pages 191-222, December.
  2. George-Marios Angeletos & Christian Hellwig & Alessandro Pavan, 2003. "Coordination and Policy Traps," NBER Working Papers 9767, National Bureau of Economic Research, Inc.
  3. Rochet, Jean Charles & Vives, Xavier, 2002. "Coordination Failures and the Lender of Last Resort: Was Bagehot Right After All?," CEPR Discussion Papers 3233, C.E.P.R. Discussion Papers.
  4. Morris, Stephen & Shin, Hyun Song, 1998. "Unique Equilibrium in a Model of Self-Fulfilling Currency Attacks," American Economic Review, American Economic Association, vol. 88(3), pages 587-97, June.
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  17. Katz, Michael L & Shapiro, Carl, 1986. "Technology Adoption in the Presence of Network Externalities," Journal of Political Economy, University of Chicago Press, vol. 94(4), pages 822-41, August.
  18. Harold L. Cole & Timothy J. Kehoe, 1998. "Self-fulfilling debt crises," Staff Report 211, Federal Reserve Bank of Minneapolis.
  19. Cooper, Russell & John, Andrew, 1988. "Coordinating Coordination Failures in Keynesian Models," The Quarterly Journal of Economics, MIT Press, vol. 103(3), pages 441-63, August.
  20. Stefania Albanesi & V. V. Chari & Lawrence J. Christiano, 2003. "Expectation Traps and Monetary Policy," Review of Economic Studies, Oxford University Press, vol. 70(4), pages 715-741.
  21. Giancarlo Corsetti & Bernardo Guimaraes & Nouriel Roubini, 2003. "International Lending of Last Resort and Moral Hazard: A Model of IMF's Catalytic Finance," NBER Working Papers 10125, National Bureau of Economic Research, Inc.
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