Spatial linkage networks and patterns of urban economic efficiency in the perspective of scaling law:A case study of Yangtze River Delta Urban Agglomeration
This paper aims to examine the characteristics and patterns of the spatial linkage networks of urban economic efficiency so as to provide new policy insights into the regional integration process.The study builds a theoretical framework to analyze the spatial linkage of urban economic efficiency among cities from the perspective of scaling law.It constructs an analytical paradigm to reflect the network externalities.The Yangtze River Delta Urban Agglomeration(YRDUA)is selected as a case study,and the improved gravity model and social network analysis are applied to measure the urban economic efficiency from 2000 to 2020,analyze the strength of inter-city linkages,and construct a spatial linkage matrix.The results reveal that:(1)the high economic efficiency zone of the YRDUA is gradually shifted from the high-grade cities in the east to the low-grade cities in the northwest;(2)the high-grade cities occupy a central position in the network,forming solid links and"small groups"with the neighboring cities;(3)in the linkage pattern of the urban agglomeration,the Shanghai-Suzhou,Hangzhou-Ningbo,and Hefei clusters show a dual-center,radiation-type and siphon-type coexistence.In contrast,the Nanjing cluster shows a single-center radiation pattern.The linkage paths of the cities in these four clusters are relatively fixed,and the linkage patterns evolve slowly.These findings coincide with the theory of city"quality"in urban geography and the theory of city links in economic geography,and provide empirical support for the integrated and coordinated development of the YRDUA,as well as emphasize the importance of the coordinated development pattern of the"wild goose"echelon structure,which is essential for the understanding of the development of the YRDUA.
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