中文摘要：

文章基于中国工业企业一海关匹配数据，以加成率为视角对中国出口企业产品创新行为与盈利能力关系进行考察。研究发现：出口企业产品创新行为提升了加成率；东部地区出口企业产品创新的“加成率效应”最大，其次是中部地区，西部地区并不显著；资本密集型、技术密集型出口企业均有显著的“加成率效应”，但劳动密集型企业并无该效应；民营和外资出口企业的产品创新均显著提升加成率水平，但国有企业并不明显；通过扩展的M—O模型，文章进一步揭示了出口企业产品创新对加成率影响的内在机理，理论结果表明产品创新带来的出口产品质量提升是该效应成立的关键，经验结果证实了理论命题。

英文摘要：

In this paper, we investigate the relationship between product inno- vation and profitability of China＇s export firms based on the matching data of China＇s industrial firms and customs trade. The results show that product innova- tion of export firms improves markups. Secondly, the product innovation export firms in the east have largest ＂markup effects＂ followed by the central region, while the west is not significant. Thirdly, the capital intensive and technology in- tensive export firms have significant ＂markup effects＂, while labor intensive firms do not. Fourthly, private and foreign export firms significantly improve markups, while state-owned enterprises have no significant effects. Fifthly, by the extended M-O model, this paper further reveals the mechanism of export firms＇ product innovation and markups. Theoretical results show that export product qual- ity upgrading is the key to this ＂markup effects＂ and empirical results confirm the theoretical propositions.