国际自由贸易会有助于贸易两国整体社会福利的提升,这可以从H-O定理中可见一斑,但如果对自由贸易设置关税壁垒将会减少该效用。现有的文章一般都是从关税的生产效应、消费效应和税收效应的角度来论证大国征收关税对本国社会整体福利的影响,本文创新点在于从马歇尔需求曲线角度分析从而探讨角度不同,其结论的异同之处,得到结论最后本文以海尔集团为例,对海尔集团的战略选择做了简单的分析。 International free trade can help improve the overall social welfare of both countries. This can be seen from the H-O theorem. However, setting a tariff barrier on free trade will reduce this effect. The existing articles are generally from the perspective of the production effect, consumption effect and tax effect of tariffs to demonstrate the influence of tariffs collected by big powers on the overall social welfare of the country. The innovation point of this paper lies in the analysis from the perspective of Marshall’s demand curve to explore the different perspectives. Similarities and differences between the Department, to be concluded Finally, this paper, Haier Group, for example, made a simple analysis of the strategic choice of Haier Group.