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产业内投资是指一个国家的同一个产业内的双向直接投资。目前,对产业内投资的研究基本上集中于产业内投资的存在性和产业内投资的影响因素,而很少涉及产业内投资和产业内贸易的关系。本文构建了一个产业内贸易与产业内投资的模型,说明在一定情况下产业内贸易和产业内投资是互为补充的,产业内投资促进了产业内贸易的增长。并且利用美国1991～2004年化工、金属和机械制造这3个产业的数据检验了所得出的结论。
Intra-industry investment refers to two-way direct investment in the same industry within a country. At present, the research on intra-industry investment mainly concentrates on the existence of intra-industry investment and the influencing factors of intra-industry investment, but seldom relates the relationship between intra-industry investment and intra-industry trade. This paper constructs a model of intra-industry trade and intra-industry investment, which shows that under certain circumstances intra-industry trade and intra-industry investment complement each other and intra-industry investment promotes intra-industry trade growth. And the use of the United States from 1991 to 2004 chemical, metal and machinery manufacturing data of these three industries tested the conclusions drawn.