Before revision:  We show that generically there exists an equivalent martingale measure for the clearing price , for all possible strategies of the large trader, if the driving noise is a Brownian sheet, while there may not be if the driving noise is multidimensional Brownian motion.
After revision:  We show that generically there exists an equivalent martingale measure , the clearing price , for all possible strategies of the large trader, if the driving noise is a Brownian sheet, while there may not be if the driving noise is multidimensional Brownian motion.