Working Paper #16-05 Interim Rationalizability Eddie Dekel , Drew Fudenberg and Stephen Morris This paper proposes the solution concept of interim rationalizability, and shows that all type spaces that have the same hierarchies of beliefs have the same set of interim rationalizable outcomes. This solution concept characterizes common knowledge of rationality in the universal type space. Jel Nos.: C70, C72 Keywords: Rationalizability, incomplete information, common knowledge, universal type space, strategic topology PAPER in PDF