This paper empirically investigates the effect of returns in the US on the returns in Colombia during 1988-2007. Monthly data is used. A new method that is robust to non-normality and time-varying volatility is applied. Our empirical findings indicate that the Colombian financial market is...

Purpose Option pricing is an integral part of modern financial risk management. The well-known Black and Scholes (1973) formula is commonly used for this purpose. The purpose of this paper is to extend their work to a situation in which the unconditional volatility of the original asset is...