行走边缘

*When a country allows trade and becomes an exporter of a good,domestic producersof the good are better off,and domestic consumers of the good are worse off.Trade raise the economic well-being of a nation in the sense that gains of the winners exceed the losses of the losers.进口国同理推断。*both tariffs and import quotas raise the domestic price of the good,reduce the welfare of domestic consumers,increase the welfare of domestic producers,and cause deadweight loss.the difference is:a tariff raises revenue for the government,whereas an import quota creates surplus for license holders.