Mudança nas estruturas de mercado da agricultura brasileira pós-abertura econômica da década de 90 do século XX*

In a context of economic openness, technological innovation and of relevance of agribusiness for the Brazilian economy, we have examined what would be the market structures of the sectors with which agriculture maintains exchange relations both in the purchase of inputs and in the sale of its output. So our objective was to characterize the market structures of the Brazilian agriculture, as well as its tendency, in the period from 1990 to 2002. In this context, all of the appraised sectors, except for sugar, not only they presented a growing economic concentration but also an increase in the inequity of revenue distribution among their companies. Therefore we conclude that the Brazilian agriculture has been under pressure from both the sectors from which it acquires its inputs and the sectors with which it negotiates its output.