Several authors have proposed series expansion methods to price options when the risk-neutral density is asymmetric and leptokurtic. Among these, Corrado and Su (1996) provide an intuitive pricing formula based on a Gram-Charlier Type A series expansion. However, their formula contains a...

[eng] Does market volatility increase ? . The French stock exchange has known a deep fall in prices for 3 years with great uncertainties on economic activity and firms' finances. So, this article deals with the size of market' s turbulences, their origins and the measures to take. A proper...