Comparative advantage is determined by ? A. actual differences in labor productivity between countriesB. relative differences in labor productivity between countries C. Both (a) and (b) D. Neither (a) nor (b)

Mercantilism ? A. Is the philosophy of free international trade?B. Was a system of export promotion and barriers to imports practiced by governments? C. Was praised by Adam Smith in the Wealth of Nations D. Both (a) and (c)