Before revision: Assuming that agents' preferences satisfy first-order stochastic dominance, we show how the (Generalized) Expected Utility paradigm can rationalize all optimal investment choices: the optimal investment strategy in any behavioral law-invariant (state-independent) setting corresponds to the optimum for a risk averse (generalized) expected utility maximizer with an explicitly derived concave  utility function.
After revision: Assuming that agents' preferences satisfy first-order stochastic dominance, we show how the (Generalized) Expected Utility paradigm can rationalize all optimal investment choices: the optimal investment strategy in any behavioral law-invariant (state-independent) setting corresponds to the optimum for a risk averse (generalized) expected utility maximizer with an explicitly derived concave non-decreasing utility function.