Impact of Double-cycle Coupling and Coordinated Development on the Agglomeration of Productive Service IndustriesEmpirical Analysis Based on the Data of 16 Prefecture-level Cities in Anhui

The coupling coordination degree model is used to measure the level of economic double-cycle coupling and coordination development of 16 prefecture-level cities in Anhui from 2009 to 2020. A panel regression model is constructed to analyze the impact of dual-cycle coupling and coordinated development on the agglomeration of producer services. The research results show that the coordination degree of the coupling of the two cycles in most prefecture-level cities has increased to a higher level in fluctuation, and the internal and external cycles of the economy show roughly the same change trend. The coupled and coordinated development of the double cycle has a significant impact on the agglomeration of productive service industries, and the impact varies in different planning regions.