Industrial symbiotic agglomeration and green economic growth: A spatial difference-in-differences approach

Abstract

As a new form of industrial organization, there is still a lack of research on how industrial symbiotic agglomeration affects green economic growth. To fill this research gap, this paper analyzes the impact mechanism of industrial symbiotic agglomeration on green economic growth from the perspective of energy efficiency, waste recycling, and green technology innovation. Based on the data of Chinese cities from 2004 to 2019, we use the spatial difference-in-differences approach for empirical testing. The research concludes: (1) Industrial symbiotic agglomeration can both significantly promote green economic growth and have a spillover effect on neighboring cities. (2) The specific spillover effects are divided into three cases. Diffusion effect (within 150 km), siphon effect (150 km–750 km), no significant spatial effect (over 750 km). (3) The promotion and spillover effects of industrial symbiotic agglomeration on green economic growth can only be brought into full play when a certain threshold is reached. The local promotion effect requires the area of the symbiotic agglomeration area to be greater than 106 km2, while the spillover effect requires a larger scale (greater than 393.2 km2) for it to manifest itself. This has theoretical and practical significance for promoting green growth and achieving sustainable development through symbiotic agglomeration.