Thinkers of great prominence who had been Smith and Ricardo, as well as os Fisiocratas, had created great theories having aimed at to explain the real economics between the social classrooms. Other points of great Desta Quem its studies had been the origin of the income, the value of the merchandises, areas of exchange, the creation and distribution of the wealth in the society, advisor of the work and the generation of the economic excess. Smith and Ricardoformularam theories aiming at to explain which would be the best form of spaces to keep international commercial relations. Centuries XVII eXVIII if had detached with the sprouting of great economic theories emuma time where not still on studies the economy and in this context surge the Fisiocratas, Smith and Ricardo bringing great advances for Ciencias Economics.Palavras-key: Fisiocratas; Smith; Ricardo; Economic theories. 1.Introduo centuries XVII and XVIII had been very promising for economic sciences. It was in this period that had started to appear the great thinkers and studious that would come to formulate theories that tried to explain the economic reality of the time leaving of the comment of the reality that they lived deeply. In this context, the Fisiocrtica School appears, with French origin and that it defended the existence of a natural order, on the basis of which the society would have to be organized. The Isocrates believed that only agriculture is that it could generate an excess and thus had formulated its theories leaving of the beginning of agriculture as center of the generation of wealth in the society. A great evidence of the prominence given for the Isocrates to agriculture is its Tableau Economic, where they showed through a diagram the distribution of the income for the three classrooms of the society, being that in the end the income returned to the land proprietors. Later they appear Adam Smith and David Ricardo giving beginning to the Classic School and considering great alterations what he had been displayed until then for the Isocrates and mercantilists.