Before revision:  The paper is completed by some computer drawings showing the behaviour of the optimal inventory for spot prices given by a geometric Brownian motion , an exponential jump-diffusion , or an exponential Ornstein-Uhlenbeck process .
After revision:  The paper is completed by some computer drawings showing the behaviour of the optimal inventory for spot prices given by a geometric Brownian motion and by an exponential jump-diffusion , or an exponential Ornstein-Uhlenbeck process .