Overreaction in the Brazilian Stock Market from 1995 until 2003 / Análise da sobre-reação de preços no mercado de ações brasileiro durante o período de 1995 a 2003




This dissertation analyzes the possibility of obtaining gains by adopting contrarian investments policy in the Brazilian Stock Market during the period from 1995 to 2003, in order to prove the existence of the overreaction bias in the investors? behavior. As a complementary objective, it was explored whether the strategy performance depends upon the measure employed to address performance, time period, cumulating returns method or number of securities in the portfolios. The research has involved different measures of performance: total return, market excess return and risk-adjusted return for different time horizons: monthly, quarterly, semi-annually, annually and biannually. It was computed two methods for cumulating returns, arithmetic and buy-and-hold, and also various quantitites of securities in each portfolio. The statistical procedures used to measure the degree of association were: difference of sample means test, proportions test and Spearman?s correlation coefficients. The sample included all stocks listed in Bovespa, with available data in the Economática database. Results show that there is an opportunity to gain in the short-time horizon, once the contrarian investment strategy presented statistically significant gains for monthly and quarterly periods.


investment strategy finanças comportamentais estratégia de investimentos overreaction behavioral finance overreaction

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