摘要：As long as, taken in isolation, every theory of value is not able to provide a full explanation of the mechanism of formation and evolution of prices, it seems inevitable a scientific approach towards joint thesis upon which they are based. Price turns out to be an expression of trade, which, from the point of view of the producer, is a ratio between two socially necessary labour times. On the other hand, if we judge it from the point of view of the consumer, we can not disagree with the fact that the key element in assessing the value of a commodity is its utility, the magnitude is given by the marginal utility and the price is monetary expression of its marginal final utility
