equivalent martingale measure is a folk theorem, see Harrison and Kreps (1979). We establish a microeconomic foundation of … martingale measure sets, in a dynamic trading framework under absence of prior depending arbitrage. We prove the existence of …

European claim. This allows pricing and hedging under the minimal martingale measure, corresponding to the local risk …-minimizing strategy. Furthermore, since the mean-variance tradeoff process is deterministic in our setup, the minimal martingale- and … variance-optimal martingale measures coincide. Consequently, the mean-variance optimal strategy is easily constructed. Simple …