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Topologies on Types: Connections

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  • Yi-Chun Chen
  • Siyang Xiong

Abstract

For different purposes, economists may use different topologies on types. We char- acterize the relationship among these various topologies. First, we show that for any general types, convergence in the uniform-weak topology implies convergence in both the strategic topology and the uniform strategic topology. Second, we explicitly con- struct a type which is not the limit of any finite types under the uniform strategic topology, showing that the uniform strategic topology is strictly fi ner than the strategic topology. With these results, we can linearly rank various topologies on the universal type space, which gives a clear picture of the relationship between the implication of types for beliefs and their implication for behaviors.

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Bibliographic Info

Paper provided by Northwestern University, Center for Mathematical Studies in Economics and Management Science in its series Discussion Papers with number 1470.

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Date of creation: 28 May 2008
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Handle: RePEc:nwu:cmsems:1470

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Postal: Center for Mathematical Studies in Economics and Management Science, Northwestern University, 580 Jacobs Center, 2001 Sheridan Road, Evanston, IL 60208-2014
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Web page: http://www.kellogg.northwestern.edu/research/math/
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Related research

Keywords: the universal type space; the strategic topology; the uniform strategic topology; the uniform-weak topology; interim correlated rationalizable actions;

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