Sulle deviazioni efficienti del prezzo dal costo marginale
Abstract The analysis of the efficiency aspects of market equilibrium is usually based on comparisons between the case under consideration and perfect competition as the ideal term of reference. According to this methodology, public intervention is justified as a means to force firms exercising some control on the market to behave as in a quasi-competitive system.During the last decades, however, the advanced economies experienced that new efficiency requisites should be taken into consideration. Among other factors, the internationalization of the economic systems reduced dramatically any preoccupations for deviations from perfect competition conditions.Accordingly, it seems reasonable to modify the efficiency criteria concentrating on the existence of barriers to the entry. Only when deviations of price from marginal cost are due to such barriers should a public intervention be allowed, whilst in principle governmental interferences with the market should have a minor role.