Abstract
It is to analyze the market by incorporating the notion of knowledge, long ignored economics. Have focused on issues of social interactions (exchanges) that are at the heart of concerns. Indeed, microeconomics (the theory of individual shares) standard (Walras, French economist of the nineteenth century) is not a realistic model of the market to the extent that the agents are isolated and anonymous and they have a perfect or classical information (economic agent knows and anticipates all), which is not very true in our current economy, as information is scarce and expensive. It is the existence of a single price which is the information vector. As agents do not they need to interact because the only price sufficient for their information. But in reality it's the uncertainty, the agents do not know everything about everything and imperfect information and rare.
More strategic interactions are an integral part of the functioning of the market. Similarly, there is a price dispersion confirm the limits of the theory of general equilibrium under Walras (at a price request is associated to an offer or a request is associated), or, an offer is an associate multiple applications and interactions comes into play in this particular context, because the information is not perfect, it is cheated.
