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The aim of this research was to measure market concentration in brazilian supply chain of soybean. From this information it became possible to assess whether strategies to maintain and increase market power and governance throughout the soybean production chain resulted in success of the industry. In this context, we calculated the Market Share, Concentration Ratio and the Herfindahl-Hirschmann index. The hypothesis that the market that provides inputs to farmers Soy is highly concentrate was confirmed. The hypothesis of high concentration in the segment acquisition and processing of soybeans was also confirmed. It was concluded that farmers Soybean is in a situation of economic weakness, since a) acquires inputs in oligopolistic market and sell the production oligopsonistic market; b) dominant firms are protected by barriers to entry. Given this scenario and the performed analysis, it is the Brazilian state define the type of participation of national stakeholders, especially the farmers: whether it is characterized as an instrument of accumulation of international capital or participate in the gains and will constitute as a development agent regional.

Estudo da Concentração de Mercado ao Longo da Cadeia Produtiva da Soja no Brasil