This study examines how the development of financial institutions—measured by the Financial Institution Development (FID) Index,which combines dimensions of depth, access, efficiency, andstability—influences development outcomes at the district/city level.Using a quantitative-causal design, we combine stepwisedifference-in-differences (DiD), macroprudential policy eventstudies, and spatial panel models to capture inter-regionalmechanisms and spillovers. The unit of analysis is a district/citypanel (2016–2024) linked to indicators for banking, fintech, retailpayments, and regional macro variables. Results show thatincreasing FID significantly increases MSME productivity and laborformalization, accompanied by a decrease in non-performing loans(NPLs). Event-study estimates show a flat pre-policy period and astrengthening positive effect 1–3 years post-policy, consistent withlower transaction costs and improved credit screening.Heterogeneity analysis reveals an urban–rural gap: urban areasexperience higher elasticity, while rural areas lag behind on riskadjustedinclusion. Bank-fintech coexistence demonstratesstronger cost discipline effects in competitive markets, whileSharia-dominated regions exhibit good inclusion with relativelymanageable risk profiles. The spatial model indicates meaningfulspillovers, underscoring the importance of cross-districtcoordination (data interoperability, payment corridors, and ashared credit registry). These findings suggest a policy agenda:rural enablement (agents, literacy, shared KYC), bank-fintech dataexchange standards, an adaptive macroprudential frameworkbased on FID, and cross-authority spatial governance to balanceinclusion, intermediation quality, and system resilience
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