论文部分内容阅读
在城市化快速发展阶段,人口集聚是否可以促进人际间知识的交流,从而成为推动企业自主创新的重要动力?本文根据不同职业的工作环境和技能需求特征,以及不同行业的职业结构数据,构建了行业沟通密集度,并结合1998—2007年中国工业企业数据首次对这一假说进行了实证检验。基于断尾回归和Heckman两阶段估计的研究发现:沟通外部性确实是人口集聚影响企业自主创新的重要渠道,其不仅提高了企业的研发概率,而且还扩大了企业的研发支出。此外,本文采用1920年人口密度控制内生性后,发现上述结论依然成立。
In the rapid development stage of urbanization, whether population concentration can promote the exchange of knowledge between people and thus become an important motivation to promote independent innovation? According to the characteristics of work environment and skills needs of different occupations, and the occupational structure data of different industries, Industry communication intensity, combined with the data of Chinese industrial enterprises from 1998 to 2007 for the first time this hypothesis was tested empirically. Based on the two methods of end-of-line regression and Heckman’s two-stage estimation, it is found that communication externality is indeed an important channel for population agglomeration to affect enterprise independent innovation, which not only improves the R & D probability of enterprises but also increases the R & D expenditure of enterprises. In addition, after adopting the endogenous population density control in 1920, we find that the above conclusion still holds.