关税削减、多产品企业与中国进口的扩展边际

文章基于异质性企业贸易理论中的多产品企业视角,运用2000~2006年中国海关的微观数据分解了中国进口的二元边际,并结合高度细化的关税数据实证分析了关税削减对中国进口扩展边际的影响。研究表明:多产品企业内部的扩展边际约占中国进口总额的50%,关税削减在短期内增加了进口企业数和进口产品种类的扩展边际,但却减少了进口市场的扩展边际;在长期内,关税下降分别从企业、产品、市场的3个维度促进了中国进口扩展边际的增长。

Tariff Reduction,Multiproduct Firms and Extensive Margin of China＇s Import

Based on multi-product firm＇s perspective from trade theory of heterogeneous firms, this paper decomposed China＇s import using China Custom＇s micro data in 2000-2006, and investigated the impact of tariff reduction on the extensive margin of China＇s import using highly disaggregated tariff data. Research results showed that multi-product firms＇ extensive margin approximately accounted for 50% of China＇s total imports. In the short run, tariff reduction increased extensive margins through adding importing firm＇s number and product＇s variety, but decreased extensive margins through shrinking importing market. In the long run, tariff decline promoted extensive margins of China＇s import respectively through all the three dimensions of firm, product and market.