The Brazilian Law of Competition Defense does not have a special system of collusion proofs to be adopted by the Antitrust Authority. The usual procedure consists in analyzing the structure and conduct characteristics of anticompetitive actions. Nevertheless, this method presents remarkable restrictions, such as the supposition of a causal relationship between structure, conduct and performance variables. The objective of this paper is to present a complementary method ological instrument for the detection of collusion that can contribute towards obtaining indirect evidence. For this purpose, we apply the results of a model of strategic choices of capacity in a Brazilian steel segment, recently condemned by collusion. The test shows that it is possible to proceed by using an auxiliary path that verifies collusive results and not only those related to market power, even when the information about the firms are difficult to obtain. Collusion in the Brazilian steel sector: A new industrial economy approach Resumo A Lei de Defesa da Concorrencia brasileira nao possui uma disposigao es pecial sobre 0 sistema de provas de colusao a ser adotado pela Autoridade An titruste. a procedimento de avaliagao tradicional tern sido analisar os condi cionantes estruturais e de conduta de agoes ditas anticornpetitivas. Entretanto, este metodo possui lirnitagoes significativas, como a suposigao de uma relagao causal entre as variaveis de estrutura, conduta e performance, e a enfase em comportamentos anticornpetitivos. Este artigo tern por objetivo apresentar urn instrumento metodo16gico complementar de detecc;ao de colusao que possa con tribuir na obtenc;ao de provas indiretas. Aplica-se, para tanto, os resultados de urn modelo de escolhas estrategicas de capacidade em urn segmento siderurgico recentemente condenado por colusao. 0 teste rnostra que e possIvel utilizar urn caminho auxiliar de atuagao das autoridades antitruste, de verificagao de resul tados colusivos e nao somente de poder de mercado, por rnais escassas que as informagoes sobre as fi rmas venham a ser.

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