FORWARD PRICES AS FUNCTIONALS OF THE SPOT PATH IN COMMODITY MARKETS MODELED BY LEVY SEMISTATIONARY PROCESSES

We show that the forward price can be represented as a functional of the spot price path in the case of Lévy semistationary (LSS) models for the spot dynamics. The functional is a weighted average of the historical spot price in general, and is derived by means of the Laplace transform. For the special cases of continuous-time autoregressive (CAR) moving average and Gamma-LSS processes for the spot dynamics, we are able to produce an analytical weight function. Both classes of processes are of interest in markets for power, weather and shipping, and we provide a discussion of the results based on numerical examples.