Please use this identifier to cite or link to this item: http://hdl.handle.net/10419/150081
Authors: 
Dekel, Eddie
Fudenberg, Drew
Morris, Stephen
Year of Publication: 
2006
Citation: 
[Journal:] Theoretical Economics [ISSN:] 1555-7561 [Volume:] 1 [Year:] 2006 [Issue:] 3 [Pages:] 275-309
Abstract: 
We define and analyze a "strategic topology'' on types in the Harsanyi-Mertens-Zamir universal type space, where two types are close if their strategic behavior is similar in all strategic situations. For a fixed game and action define the distance between a pair of types as the difference between the smallest epsilon for which the action is epsilon interim correlated rationalizable. We define a strategic topology in which a sequence of types converges if and only if this distance tends to zero for any action and game. Thus a sequence of types converges in the strategic topology if that smallest epsilon does not jump either up or down in the limit. As applied to sequences, the upper-semicontinuity property is equivalent to convergence in the product topology, but the lower-semicontinuity property is a strictly stronger requirement, as shown by the electronic mail game. In the strategic topology, the set of "finite types'' (types describable by finite type spaces) is dense but the set of finite common-prior types is not.
Subjects: 
Rationalizability
incomplete information
common knowledge
universal type space
strategic topology
JEL: 
C70
C72
Creative Commons License: 
https://creativecommons.org/licenses/by-nc/2.5
Document Type: 
Article

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