Regression results of mechanism of action.

This article provides a detailed analysis and empirical support for the fiscal decentralization system, exploring its mechanisms in regulating the imbalance and insufficiency of regional economic development in China. The research found that fiscal decentralization, as a social governance tool, has a significant positive effect on narrowing the economic development gap between cities and addressing developmental disparities, particularly in the southern and vast inland regions of China. This effect provides important impetus for regional economic balance and comprehensive development. Secondly, mechanism testing revealed that technological support and the optimization of the administrative environment play crucial roles in promoting balanced regional economic development. By optimizing the industrial structure and strengthening the regulatory strategy for fiscal pressure, the positive impact of fiscal decentralization on economic development can be significantly enhanced. Furthermore, this study employs panel data threshold effect analysis to reveal that the level of tax competition moderates the effects of fiscal decentralization within a certain range, which in turn impacts the trajectory of economic development. These insights aim not only to leverage the fiscal decentralization system to alleviate and improve the uneven and inadequate economic development among regions in China and help achieve the goal of social governance, but also to provide a solid theoretical basis and practical guidance for the government in designing more precise and effective economic policies, which holds significant strategic importance and practical value.本文针对财政分权（fiscal decentralization）体系展开了细致剖析并提供实证支撑，探究其在调节中国区域经济发展不平衡不充分问题中的作用机制。研究表明，作为社会治理工具的财政分权，对缩小城市间经济发展差距、化解发展失衡具有显著正向效应，这一作用在中国南方及广袤内陆地区尤为凸显。该效应为区域经济均衡与全面发展提供了重要动力。其次，机制检验显示，技术支撑与行政环境优化在推动区域经济均衡发展中扮演关键角色。通过优化产业结构、强化财政压力调控策略，可显著增强财政分权对经济发展的正向影响。此外，本研究采用面板数据门槛效应分析（panel data threshold effect analysis）揭示：税收竞争（tax competition）水平会在一定范围内调节财政分权的作用效果，进而影响经济发展轨迹。上述研究结论，不仅旨在借助财政分权体系缓解并改善中国区域经济发展不平衡不充分的现状，助力达成社会治理目标，更为政府制定更为精准有效的经济政策提供了坚实的理论依据与实践指引，具备重要的战略意义与实践价值。