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Eficiência Adaptativa nos Mercados Futuros Agropecuários Brasileiros* * Os autores agradecem aos comentários e sugestões do editor, do parecerista anônimo, assim como de Alexandre Florindo Alves, Daniel Henrique Dario Capitani, José Cesar Cruz Júnior, Juan Carlos Escanciano e Paulo Fernando Cidade de Araújo.

This study aims to analyze the degree of efficiency of Brazilian agricultural future markets, under the adaptive market hypothesis. Through recent developments for Nonlinearity and Variance Ratio tests, it has been shown that the rejections to the martingale difference hypothesis at high levels are found in markets that governmental intervention is recurrent-i.e., corn and ethanol. Concerning coffee, live cattle, and soybeans markets, weaker rejections to the martingale hypothesis indicate a higher level of informational efficiency in these three markets when compared to both corn and ethanol future markets. These evidences-consistent with the adaptive market hypothesis-justify dynamic hedge operations, as well as an active management of investment portfolios in such markets.


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