INTRODUCTION With the reinforcement and consolidation of the Second Industrial Revolution, in the end of century XIX it was possible to perceive an increase in offers and the demand of goods and services never before seen, what certainly it provided to the competition between the companies and also the concentration of the economic-financial power in the centers where if they concentrated such companies. In this period the great corporations had also appeared, that possuam in its safes a voluminous addition of capital, what it propitiated high investments and it fortified the competition, therefore when the great ones concurred, suffocated the lesser corporations and immediately afterwards, it was possible to foresee that a great one would lose. Knowing of such difficulties and uncertainties of the market, in this period also, the attempt to stabilize the market and its competitive fight, many companies had finished using of fusing, holdings, joint venture, pools and monopolies. In this article she will be possible observes the structure of the market, its concept and its species, examples and its regulations. THEORETICAL RECITAL 1. Concept of Market A group of purchasers and salesmen of one determined or service well. Where the purchasers determine the demand and the salesmen determine offer of the good or service. 2.
Structure of Market The Structures of Market are models that catch aspects of as the markets are organized. Each structure of market detaches essential aspects of the interaction of offers and the demand, being based on characteristics observed in existing markets. In all the classic structures the agents are maximizadores of profit. The market structures are conditional for three main 0 variable: ) number of producing firms in the market; b) differentiation of the product; c) existence of barriers to the entrance of new companies.