题目: Suppose the production possibilities for two countries, producing either food or clothing, are shown in the below figure. They can each produce any linear combination as well. Measuring food on the horizontal axis, the joint production possibility frontier (A)will have a slope of -2/3 over the entire frontier. (B)will have a slope of -2 when less than 20 units of food are produced. (C)will have a slope of -1 when less than 20 units of food are produced. (D)will have a slope of -1/2 when less than 20 units of food are produced. Total Potiential Output in Each Country Using All Resources in One Industry USA Canada Food 20 10 Clothing 10 10 高点解答: (C) 20f+10c=La 10f+10c=Lb ==> slope=-1,f<Lb/10 鼎茂解答: (A) USA Canada Total Food 20 10 30 Clothing 10 10 20 ==> slope=-2/3 陈伟解答: (D) 画出联合PPC:0<Food<20,10<Clothing<20:USA的PPC ==> slope=-1/2 20<Food<30,0<Clothing<10:Canada的PPC 三本书三种不同解答,我完全被搞迷糊了 --

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