Ben bakes bread and Shawna knits sweaters. Ben and Shawna both like to eat bread and wear sweaters. In which of the following cases is it impossible for both Ben and Shawna to benefit from trade?
A、Ben cannot knit sweaters and Shawna cannot bake bread.
B、Ben is better than Shawna at baking bread and Shawna is better than Ben at knitting sweaters.
C、Ben is better than Shawna at baking bread and at knitting sweaters.
D、Both Ben and Shawna can benefit from trade in all of the above cases.
A、Ben cannot knit sweaters and Shawna cannot bake bread.
B、Ben is better than Shawna at baking bread and Shawna is better than Ben at knitting sweaters.
C、Ben is better than Shawna at baking bread and at knitting sweaters.
D、Both Ben and Shawna can benefit from trade in all of the above cases.
微观经济学（全英）
章节列表
1. General Overview of Economics282. Principles of Economics353. Circular-Flow Diagram and PPF204. Interdependence and Trade205. Demand and Supply756. Elasticity717. Price Control and Taxation408. CS, PS and the Efficiency of Markets109. Costs of Taxation2510. International Trade3011. Externalities3112. Public Goods and Common Resources2013. The Costs of Production20