試題詳解

5. Suppose that Nation X can produce either 60 units of apple or 20 units of banana per year, and Nation Y can produce either 20 units of apple or 60 units of banana per year. Before trade, Nation X produces and consumes 30 units of apple and 10 units of banana per year. Nation Y produces and consumes 10 units of apple and 30 units of banana. Suppose that trade is initiated between the two countries, and Nation X sends 30 units of apple to Nation Y in exchange for 30 units of banana. Nation X will now be able to consume a maximum of
(A) 40 units of apple and 20 units of banana.
(B) 40 units of apple and 30 units of banana.
(C) 30 units of apple and 30 units of banana.
(D) 10 units of apple and 40 units of banana.