Even though the rapid development of informal sector promotes economic growth through bringing many job op-portunities and meeting diverse consumer demand, it indeed gives a significant impact on operation of Chinese manufactur-ing.Based on the data of World Bank Business Environment and Enterprise Performance Survey, this paper analyzes the effect of the competition from informal sectors on the innovation activities of manufacturing enterprises. The results indi-cate that the competition from informal sectors plays a significantly positive role in increasing the tendency and intensity of R&D investment; meanwhile, there shows a significantly positive relationship between the competition from informal sec-tors and the product innovation activities, but has no significant relationship with process innovation activities. On the contrary,innovation activities of high-tech enterprises may not affected by informal sectors. The above conclusions remain valid after controlling for endogeneity with instrument variables.To deal with the competition from informal sectors, man-ufacturing enterprises increase the investment in R&D to promote the updating the products by imitation innovation and micro innovation, so that they can be distinguished from the informal sectors in the product market.%非正规部门快速发展在缓解中国就业压力、满足低端需求和促进经济增长的同时,对中国制造业企业经营带来了很大影响.基于2012年世界银行营商环境调查数据,分析非正规部门灰色竞争对中国制造业企业创新活动的影响.研究发现:非正规部门灰色竞争显著增加企业研发投入倾向和研发投入强度;灰色竞争与企业产品创新活动有显著正相关关系,但未发现与企业流程创新活动有显著关系;制造业中高新技术企业创新活动受非正规部门灰色竞争的影响相对较弱.用工具变量控制内生性后,以上结论依然成立.为了应对非正规部门的灰色竞争,制造业企业应不断强化研发投入,通过模仿创新和微创新的方式加速产品更新升级,以区分于非正规部门的产品.
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