Connaissance commune et consensus

In a seminal paper, Aumann [1976] showed that if agents have common knowledge of their posterior probabilities of some event, then these posteriors must be the same, provided that they have the same prior probability. This result has given rise to a vast literature about the implications of common knowledge for consensus. The aim of this paper is first to present how knowledge and common knowledge are modelled in economic analysis. Then we review some extensions of Aumann?s agreement theorem.