Assets Pricing in the Brazilian Stock market: CAPM and variants application. / PrecificaÃÃo de ativos com risco no mercado acionÃrio brasileiro: aplicaÃÃo do modelo CAPM e variantes.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The assets pricing models assist in the correct evaluation of the investments, as well as, to comprehend the relationship between the assets expected return and its risk. The Capital Asset Pricing Model (CAPM) and the Downside Capital Asset Pricing Model (D-CAPM), in their conditional and static versions, were tested in this study with time and cross-section series, in order to evaluate which one of them is the most adequate to the Brazilian stock market. It was used a sample of 100 assets, intentionally selected among the most negotiated at SÃo Paulo Stock Exchange (Bovespa), from January 1995 to December 2005. Assets groups were joined, following their liquidity, in 14 portfolios, each one with 7 or 8 assets. The results indicated that the investment selection can be done using either the CAPM or the D-CAPM, in their conditional and static versions, because the relationship between the return and the risk can be explained by these models. Also, it was shown that the liquidity of the analyzed portfolios influenced the obtained results, and the division of the series in two sub periods was necessary due the presence of structural breaks. The conditional D-CAPM explained better the variations of the returns in the investment portfolio analyzed in time series for the whole period and the two sub periods. In the cross section series, the obtained results in the first sub period presented to be better for the CAPM, while, in the second sub period the D-CAPM presented better results. In the whole period the results were similar to the two models. In general, the D-CAPM confirmed to be a superior technique to the CAPM in the Brazilian stock market, and the statistic version is more indicated to the more liquid portfolios and the conditional version to the less liquid portfolios.

ASSUNTO(S)

modelos de precificaÃÃo de ativos investment decisions capital asset pricing model mercado acionÃrio. anÃlise de investimentos conditional capital asset pricing model asset pricing models stock market. downside capital asset pricing model conditional capital asset pricing model administracao financeira capital asset pricing model downside capital asset pricing model

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