Hypothesis 6: The spatial spillover effects of green finance and digital inclusive finance interact and jointly influence the green transformation of manufacturing in neighboring provinces

Logical explanation: The spatial spillover effects of green finance and digital inclusive finance are not merely additive but may create synergistic effects in nearby provinces through mutual reinforcement or collaboration. For example, digital inclusive finance can facilitate financing for more low-carbon projects, making green finance policies more targeted and efficient. Meanwhile, the capital support provided by green finance can enhance digital inclusive finance's coverage of green projects for small and medium enterprises. Under their joint influence, green finance may enable digital inclusive finance to better support the diffusion of green technologies, while digital inclusive finance can improve the service efficiency of green finance. Empirical test: Introduce the spatial interaction term between green finance and digital inclusive finance into a spatial econometric model to examine whether their combined effect has a stronger impact on the green transformation of manufacturing in surrounding provinces. This can be tested by including an interaction term to explore how the two jointly function through spatial mechanisms.