This chapter studies the role played by money in the coordination process in a decentralized market economy. The first section recalls the centrality of coordination in economic theory but also, briefly, a few of the difficulties encountered in usual models when they try to integrate money. The second section shows why and how a monetary approach is a consistent and plausible alternative theory to ansmer the aforementioned questions. The third section defines a few guidelines on the problem of viability. With this in mind, questions of monetary ambivalence and permanent conflict between means of private existence and systemic viabiity appear as a consistent research direction.
