ABSTRACT
It is commonly admitted that the modern price theory fails in determining market prices out of equilibrium and in integrating the exchange activity at equilibrium prices. In this paper we show that these two difficulties have a common origin: the absence of a "market mechanism", i.e. an algorithm by which market prices and allocations resulting of a given set of individual actions are calculated. As a result of such a market mechanism, prices are determined directly as monetary prices, from which relative prices may be derived. In this way money and value theories are integrated. This problem is also examined on the ground of the history of economic analysis.
