Ahn, Hyungsok; Muni, Adviti; Swindle, Glen - In: Applied Mathematical Finance 6 (1999) 3, pp. 197-208
The Black-Scholes option pricing methodology requires that the model for the price of the underlying asset be completely specified. Often the underlying price is taken to be a geometric Brownian motion with a constant, known volatility. In practice one does not know precise values of parameters...