The Mechanism And Empirical Study Of Industrial Agglomeration Affecting Urban Economic Growth

How industrial agglomeration affects urban economic growth is a realistic problem that needs to be paid attention to in promoting sustainable development of urban economy in the process of new urbanization in China.Based on the review and analysis of existing researches,this paper discusses the influence path and mechanism of industrial agglomeration on urban economic growth from three perspectives: factor agglomeration effect,transaction cost effect and specialization spillover effect.Meanwhile,based on the panel data of 38 large and medium-sized first-tier cities from 1990 to 2017,this paper empirically analyzes the impact of industrial agglomeration on urban economic growth,as well as the heterogeneity of scale,industry heterogeneity and intermediary mechanism.This paper holds that industrial agglomeration has a positive effect on urban economic growth,and its theoretical mechanism is mainly manifested in three aspects: first,the factor agglomeration effect,that is,industrial agglomeration leads to the agglomeration and accumulation of production factors,so as to promote urban economic growth;Second,transaction cost effect,that is,industrial agglomeration reduces the average transaction cost among market players and promotes urban economic growth.Third,the spillover effect of specialization,that is,the spillover of knowledge(technology)among market players caused by industrial agglomeration,improves total factor productivity,and promotes urban economic growth.The empirical results show that: in terms of industry heterogeneity,the second industry cluster has the strongest positive effect,the third industry cluster follows,and the first industry cluster is the weakest.In terms of size heterogeneity,for the primary and secondary industries,the industrial agglomeration of large cities has a stronger impact on urban economic growth.For the tertiary industry,the industrial agglomeration of ultra-large cities has a stronger impact on urban economic growth.As far as the intermediary mechanism is concerned,the transaction cost effect of the three major industry clusters is more significant,the spillovereffect of specialization is not significant,and the intermediary effect of the factor cluster effect on the second and third industry clusters is more significant.The policy points of this paper are as follows: firstly,optimize the industrial heterogeneity and scale heterogeneity effect of industrial agglomeration;Second,reasonably strengthen the positive intermediary mechanism to promote coordinated development;Third,realize the matching development of industrial agglomeration and city scale.Fourth,strengthen supply-side structural reform and promote sustainable urban economic development through technological progress.