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Defense Policies Against Currency Attacks: on the Possibility of Predictions in a Global Game with Multiple Equilibria

Author

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  • George-Marios Angeletos
  • Alessandro Pavan
  • Christian Hellwig

Abstract

This paper studies defense policies in a global-game model of speculative currency attacks. Although the signaling role of policy interventions sustains multiple equilibria, a number of novel predictions emerge which are robust across all equilibria. (i) The central bank intervenses by raising domestic interest rates, or otherwise raising the cost of speculation, only when the value it assigns to defending the peg - its "type" - is intermediate. (ii) Devaluation occurs only for low types. (iii) the set of types who intervene shrinks with the precision of market information. (iv) A unique equilibrium policy survives in the limit as the noise in market information vanishes, whereas the devaluation outcome remains indeterminate. (v) The payoff of the central bank is monotonic in its type. (vi) The option to intervene can be harmful only for sufficiently strong types; and when this happens, weak types are necessarily better off. While these predictions seem reasonable, none of them would have been possible in the common-knowledge version of the model. Combined, these results illustrate the broader methodological point of the paper: global games can retain significant selection power and deliver useful predictions even when the endogeneity of information sustains multiple equilibria.

Suggested Citation

  • George-Marios Angeletos & Alessandro Pavan & Christian Hellwig, 2007. "Defense Policies Against Currency Attacks: on the Possibility of Predictions in a Global Game with Multiple Equilibria," Discussion Papers 1459, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
  • Handle: RePEc:nwu:cmsems:1459
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    Citations

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    Cited by:

    1. Daniëls, Tijmen R. & Jager, Henk & Klaassen, Franc, 2011. "Currency crises with the threat of an interest rate defence," Journal of International Economics, Elsevier, vol. 85(1), pages 14-24, September.
    2. Christian Bauer & Bernhard Herz, 2009. "The Dynamics of Financial Crises and the Risk to Defend the Exchange Rate," Research Papers in Economics 2009-03, University of Trier, Department of Economics.
    3. Grier, Kevin & Lin, Shu, 2009. "Speculative attacks and defenses as wars of attrition," European Journal of Political Economy, Elsevier, vol. 25(4), pages 540-546, December.

    More about this item

    Keywords

    global games; robust predictions; signaling; currency crises; regime change; multiple equilibria.;

    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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