Green finance–digital supply chain synergy and international logistics trade efficiency: evidence from China's Jing-Jin-Ji urban agglomeration

Abstract

This paper examines the impact of green finance–digital supply chain synergy on international logistics trade efficiency in the Jing-Jin-Ji region and explores the underlying mechanisms. Using panel data for 13 cities from 2013 to 2024, this study constructs green finance and digital supply chain indices based on the entropy weight method and measures their synergy using a coupling coordination degree model. International logistics trade efficiency is estimated through a super-efficiency DEA model, and a fixed-effects model is employed for empirical analysis. The results show that green finance, digital supply chains and their synergistic development exhibit an overall upward trend despite regional disparities. Green finance–digital supply chain synergy significantly improves international logistics trade efficiency, with stronger effects observed in regions with higher levels of development. Further analysis reveals that resource allocation efficiency and digital financial inclusion serve as important transmission channels. These findings provide new evidence on the role of financial and digital synergies in enhancing logistics performance and offer policy implications for promoting coordinated regional development and high-quality trade growth.