URL des Cahiers : https://halshs.archives-ouvertes.fr/CAHIERS-MSEVoir aussi l'article basé sur ce document de travail paru dans "Mathematical Social Sciences", 51, 3, 2006, pp. 274-279Cahiers de la Maison des Sciences Economiques 2005.31 - ISSN : 1624-0340Parikh and Krasucki [1990] showed that pairwise communication of the value of a function f leads to a consensus about the communicated value if the function f is convex. They showed that union consistency of f may not be sufficient to guarantee consensus in any communication protocol. Krasucki [1996] proved that consensus occurs for any union consistent function if the protocol contains no cycle. We show that if agents communicate their optimal action, namely the action that maximizes thei...