Suppose Sarah has an endowment of 2 units of X and 4 units of Y and has indifference curves that satisfy our four basic assumptions (see Chapter 3). Suppose Brian has an endowment of 4 units of X and 2 units of Y, and has preferences given by the utility function U(X, Y)  min {X, Y}, where On an Edgeworth box diagram, indicate the set of Pareto-superior bundles.