A contraction principle for finite global games
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Abstract
I provide a new proof of uniqueness of equilibrium in a wide class of global games. I show that the joint best-response in these games is a contraction. The uniqueness result then follows as a corollary of the contraction principle. Furthermore, the contraction-mapping approach provides an intuition for why uniqueness arises: complementarities in games generate multiplicity of equilibria, but the global-games structure dampens complementarities so that only one equilibrium exists.
Keywords
Global games Equilibrium uniqueness Contraction mapping Strategic complementarities Supermodular gamesJEL Classification
C72 D82References
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