This paper investigates whether there is a fraction of consumers that do not behave as fully forward-looking optimal consumers in the Brazilian economy. The generalized method of moments technique was applied to nonlinear Euler equations of the consumption-based capital assets model contemplating utility functions with time separability and non-separability. The results show that when the household utility function was modeled as constant relative risk aversion, external habits and Kreps-Porteus, estimates of the fraction of rule-of-thumb households was, respectively, 89%, 78% and 22%. According to this, a portion of disposable income goes to households who consume their current incomes in violation of the permanent income hypothesis. Este artigo investiga se existe um comportamento subótimo nas decisões de consumo intertemporal na economia brasileira. O Método Generalizado de Momentos (MGM) foi aplicado ao modelo de precificação de ativos baseados no consumo (CCAPM) contemplando funções de utilidade separáveis e não separáveis. Os resultados mostram a existência de uma parcela da população que segue esse comportamento conhecido também como rule of thumb. Em termos mais concretos a fração de indivíduos que segue a regra de bolso é, respectivamente, de 89%, 78% e 22% para as funções de utilidade modeladas segundo as hipóteses de aversão relativa ao risco constante, há-bitos externos e Kreps-Porteus. De acordo com esses resultados, uma grande parcela da população consome totalmente a sua renda corrente o que implica em violação da hipótese da renda permanente.* This article is a revised version of Marcos Gesteira's Master Thesis, done under the supervision of Carlos Enrique CarrascoGutierrez. We gratefully acknowledge the comments and suggestions Fabio Reis Gomes, Wilfredo Maldonado, José Angelo Divino and seminar participants at UCB Brasília and Sociedade Brasileira de Econometria-SBE conference in Natal, 2014. We thank an anonymous referee and Alexandre B. Cunha (Editor) for the suggestions on an earlier version of this article.
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