This paper implements an algorithm that can be used to solve systems of Black-Scholes equations for implied volatility and implied risk-free rate of return. After using a seemingly unrelated regressions (SUR) model to obtain point estimates for implied volatility and implied risk-free rate, the...

We provide an extensive set of alternative models for the estimation of the real cost of equity in a sample of utitlites firms in Brazil with monthly data from March 2006 to June 2011.The main results are that the traditional CAPM is regected and, together with the Fama-French factors, give a...

We provide an extensive set of alternative models for the estimation of the real cost of equity in a sample of utilities firms in Brazil with monthly data from March 2006 to June 2011. The traditional CAPM is rejected, together with the Fama-French factors, due to a poor fit. Additional factors...