对外贸易产生和发展以来,基本上存在两种类型的对外贸易政策,即自由贸易政策和保护贸易政策。本文试通过对关税效应的经济分析,利用博弈论的有关知识来说明自由贸易虽然有利于整个社会的社会福利最大化,但作为调节国际贸易关系以及保护性质的关税在现实世界的贸易关心中却具有不可取消性。 Since the emergence and development of foreign trade, basically two types of foreign trade policies exist, namely, free trade policies and trade protection policies. This article attempts to use the economic analysis of the tariff effect to make use of the relevant knowledge of game theory to show that although free trade is conducive to maximizing the social welfare of the entire society, the duty to regulate the international trade relations and the nature of protection in the real world trade concern Irrevocable.