- 搜标题
- 搜题干
- 搜选项
单项选择题
Product differentiation and internal economies of scale yield gains from trade in the form of ____________.
A．higher profits and lower trade costs.
B．lower production costs and a greater variety of goods.
C．the proximity-concentration effect.
D．the substitution of immigration for foreign direct investment.
B．lower production costs and a greater variety of goods.
C．the proximity-concentration effect.
D．the substitution of immigration for foreign direct investment.
