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Coordination Failures under Incomplete Information and Global Games

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  • Fukao, Kyoji

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 speculative 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.

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File URL: http://hermes-ir.lib.hit-u.ac.jp/rs/bitstream/10086/13819/1/DP299.pdf
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Bibliographic Info

Paper provided by Institute of Economic Research, Hitotsubashi University in its series Discussion Paper Series with number a299.

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Length: 25 p.
Date of creation: Oct 1994
Date of revision:
Handle: RePEc:hit:hituec:a299

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Keywords: global game; coordination failure; speculative attack; network externality;

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References

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  1. Hans Carlsson & Eric van Damme, 1993. "Global Games and Equilibrium Selection," Levine's Working Paper Archive 122247000000001088, David K. Levine.
  2. Krugman, Paul, 1979. "A Model of Balance-of-Payments Crises," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 11(3), pages 311-25, August.
  3. KOHLBERG, Elon & MERTENS, Jean-François, . "On the strategic stability of equilibria," CORE Discussion Papers RP -716, Université catholique de Louvain, Center for Operations Research and Econometrics (CORE).
  4. Paul Milgrom & Robert Weber, 1981. "Distributional Strategies for Games with Incomplete Information," Discussion Papers 428R, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
  5. 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.
  6. Van Damme, E., 1991. "Equilibrium Selection in 2 x 2 Games," Papers 9108, Tilburg - Center for Economic Research.
  7. 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, December.
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Cited by:
  1. Stephen Morris & Hyun Song Shin, 2000. "Global Games: Theory and Applications," Cowles Foundation Discussion Papers 1275R, Cowles Foundation for Research in Economics, Yale University, revised Aug 2001.
  2. Sbracia, M. & Zaghini, A., 2000. "Expectations and Information in Second Generation Currency Crises Models," Papers 391, Banca Italia - Servizio di Studi.
  3. Heinemann, Frank & Illing, Gerhard, 2002. "Speculative attacks: unique equilibrium and transparency," Journal of International Economics, Elsevier, vol. 58(2), pages 429-450, December.

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