Consider an experiment in which a person first specifies a number of dollars

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Consider an experiment in which a person first specifies the number of dollars x and then observes the value of a random variable Y. Suppose that if Y >= x, he receives Y dollars as his reward. If Y < x, he receives a random reward X having some given probability distribution. It is assumed that the random variables X and Y are independent. Show that in order to maximize the expected utility of his reward, the person should specify a number x such that U(x) = E[U(X)].