Is there a relationship between corporate governance and volatility? A study from the composed portfolios

Abstract

The relationship between risk and return is established by the uncertainty associated with the expected returns of an investment decision. In this context, the corporate governance practices, whose objective is to provide greater transparency in the dissemination of economic and financial results, assist in reducing the risk of a decision. To assess the relationship between accountability and risk/return, this paper intends to analyze the composition, risk and volatility persistence of three minimum variance portfolios. These portfolios are composed of assets by companies incorporated in different levels of corporate governance listed on BOVESPA: N1 (level 1), N2 (level 2) and NM (New Market). In this context, we developed an exploratory and descriptive research, using econometric techniques applied to the information obtained from BOVESPA. The data were processed with the help of Excel, specifically, the SOLVER program, and the application of the CAPM and the models of the ARCH family. The results show that the composition of the minimum variance portfolio significantly reduces the risk diversifiable. Also was observed a direct relationship between level of governance and risk unsystematic (NM> N2> N1). The comparative research of the portfolios collected confirmed the theory about the persistent of volatility in New Market’s companies. We conclude, therefore, that the portfolio composed of New Market’s companies is less risky than the assets formed by companies in the levels 1 or 2.