We show that there is no revelation principle for implementation in strategically simple mechanisms (Borgers and Li, ECMA 2019). In the bilateral trade problem, a strategic simple mechanisms may fail to satisfy local dictatorship and ex post individual rationality. There is, however, a...

In this paper we extend Ambrus's [A. Ambrus, Coalitional rationalizability, Quart. J. Econ. 121 (2006) 903-929] concept of "coalitional rationalizability (c-rationalizability)" to situations where, in seeking mutually beneficial interests, players in groups (i) make use of Bayes' rule in...