Sally gets pleasure from good Y but gets no pleasure from good X. Tim gets no pleasure from good Y, but gets pleasure from good X. Draw indifference curves in an Edgeworth Box (place Sally's origin at the lower left and place good X on the horizontal axis) that represent the preferences of the two consumers. Label each of Sally's curves as S1, S2, ... in order of increasing satisfaction, and label each of Tim's curves as T1, T2,... also in order of increasing satisfaction. If each consumer has some of each good and trade is possible, show the equilibrium attained when all mutually beneficial trades are undertaken.