Study On The Impact Of The Opening Of High-Speed Rail On The Agglomeration Economy Of Cities Along The Sichuan-Chongqing Area

The construction of high-speed rail has changed the communication and activities between cities.Since the Beijing-Tianjin Intercity Railway,China’s first high-speed railroad with a speed of 350 km/h,was completed and put into operation in2008,China’s high-speed railroad has entered a phase of rapid development.At present,China has established a high-speed railway network with "four horizontal and four vertical",forming a 1-2 hour traffic circle between city clusters,and an "eight horizontal and eight vertical" high-speed railway network is planned for the future.In this context,the high-speed railway in the Sichuan-Chongqing area has also been developing rapidly in recent years.The operating of high-speed railway has shortened the time and distance of economic activities and has a great impact on the interconnection and development of regional economy.Therefore,it is important to study the impact of the opening of high-speed rail on urban economic agglomeration in the Sichuan-Chongqing area.This paper studies the impact of the opening of high-speed rail on the agglomeration economy of cities in the region,taking the cities in Sichuan and Chongqing regions with high-speed rail as the research object.Firstly introduces the theories related to agglomeration economy from the theory of agglomeration economy,and reviews the existing researches in terms of the relationship between high-speed railway and agglomeration economy and the mechanism of action;secondly,it outlines the current situation of high-speed railway development and economic agglomeration in the Sichuan-Chongqing area,describes the impact brought by the operating of high-speed railway,and selects the agglomeration economy indexes according to the analysis results;again,according to the review of the existing analysis framework of the impact of high-speed rail on urban agglomeration economy is constructed.Finally,the empirical analysis is conducted with the data of cities in Sichuan and Chongqing regions from 2011 to 2020,and a multi-period double difference model is used to analyze the impact of high-speed rail opening on urban agglomeration economy.The results of this paper show that:(1)The operating of high-speed railways promotes inter-city connections,has an impact on inter-city transportation costs and rents,which in turn has an impact on the behavior of enterprises and consumers in the region,and works through the specific mechanisms of factor flow,knowledge exchange and industrial agglomeration,generating economies of scale,thus leading to changes in the population and industrial agglomeration in the city region and promoting the urban agglomeration The formation of economy.(2)Using population density and secondary and tertiary industry location entropy as agglomeration economy measures respectively,the empirical results show that the opening of high-speed rail has a significant positive impact on the agglomeration economy of cities along the high-speed rail,and the overall effects of the opening of high-speed rail are 0.04 and 0.11 respectively,which proves that the degree of impact of the opening of high-speed rail on industrial agglomeration is greater than that on population agglomeration in Sichuan-Chongqing area,while the coefficient of this impact is small,indicating that the current agglomeration economy of the coefficient of this effect is small,indicating that the economic scale effect of the operating of high-speed railway in Sichuan and Chongqing is still weak.(3)The promotion effect of HSR opening on agglomeration economy varies among cities and industries with different population sizes.The impact of HSR opening on the population agglomeration of large cities is higher than that on small and medium-sized cities,and in terms of economic agglomeration,the agglomeration level of large cities in Sichuan and Chongqing regions is also slightly more affected than that of large cities;for different industries,the impact of HSR on the location entropy of secondary industries in the region is larger,and the impact on the location entropy of tertiary industries is not significant.