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Coordination Failures under Incomplete Information and Global Games

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  • Kyoji Fukao

Abstract

Carlsson and van Damme (1991, 93) presented a notion of a global game, which is an incomplete information game where the actual payoff structure is affected by a realization of a common shock and where each player gets noisy private information of the shock. For n -person symmetric games with two possible actions characterized by strategic complementarity, they showed that equilibrium play in a global game with vanishing noise is uniquely determined. The concept of global games is important not only as a theory of the most refined notion of equilibrium but also as a theory of coordination failures under private information. From this viewpoint, this paper makes the theory of global games more general and more applicable to such problems. The implications of the theory of global games are investigated in two specific models: a peculative attack model and a network externality model. It is shown that both the monetary authority in the speculative attack model and the central planner in the network externality model will prefer the equilibrium in a global game with small noise to the worst equilibrium in the corresponding complete information game. Therefore, they will welcome the existence of small noise, if they apply mini-max principle to multiple equilibrium problems.

Suggested Citation

  • Kyoji Fukao, 2003. "Coordination Failures under Incomplete Information and Global Games," Discussion papers 03006, Research Institute of Economy, Trade and Industry (RIETI).
  • Handle: RePEc:eti:dpaper:03006
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    References listed on IDEAS

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    1. John C. Harsanyi & Reinhard Selten, 1988. "A General Theory of Equilibrium Selection in Games," MIT Press Books, The MIT Press, edition 1, volume 1, number 0262582384, January.
    2. Carlsson, Hans & van Damme, Eric, 1993. "Global Games and Equilibrium Selection," Econometrica, Econometric Society, vol. 61(5), pages 989-1018, September.
    3. van Damme, E.E.C., 1991. "Equilibrium selection in 2 x 2 games," Other publications TiSEM 1c09a228-43e3-48ec-ad9c-0, Tilburg University, School of Economics and Management.
    4. Krugman, Paul, 1979. "A Model of Balance-of-Payments Crises," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 11(3), pages 311-325, August.
    5. Kohlberg, Elon & Mertens, Jean-Francois, 1986. "On the Strategic Stability of Equilibria," Econometrica, Econometric Society, vol. 54(5), pages 1003-1037, September.
    6. Paul R. Milgrom & Robert J. Weber, 1985. "Distributional Strategies for Games with Incomplete Information," Mathematics of Operations Research, INFORMS, vol. 10(4), pages 619-632, November.
    7. Bhattacharya, Utpal & Weller, Paul, 1997. "The advantage to hiding one's hand: Speculation and central bank intervention in the foreign exchange market," Journal of Monetary Economics, Elsevier, vol. 39(2), pages 251-277, July.
    8. Carlsson, H. & Van Dame, E., 1991. "Equilibrium Selection in Stag Hunt Games," Papers 9170, Tilburg - Center for Economic Research.
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    Cited by:

    1. Stephen Morris & Hyun Song Shin, 2000. "Global Games: Theory and Applications," Cowles Foundation Discussion Papers 1275, Cowles Foundation for Research in Economics, Yale University.
    2. Heinemann, Frank & Illing, Gerhard, 2002. "Speculative attacks: unique equilibrium and transparency," Journal of International Economics, Elsevier, vol. 58(2), pages 429-450, December.
    3. Kasahara, Tetsuya, 2009. "Coordination failure among multiple lenders and the role and effects of public policy," Journal of Financial Stability, Elsevier, vol. 5(2), pages 183-198, June.
    4. Sbracia, Massimo & Zaghini, Andrea, 2001. "Expectations and information in second generation currency crises models," Economic Modelling, Elsevier, pages 203-222.

    More about this item

    JEL classification:

    • C73 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory - - - Stochastic and Dynamic Games; Evolutionary Games
    • D82 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Asymmetric and Private Information; Mechanism Design
    • D84 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Expectations; Speculations
    • F32 - International Economics - - International Finance - - - Current Account Adjustment; Short-term Capital Movements

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