Prim-Lex Theory and Global South Infrastructure Finance: From Debt Traps to Eight-Dimensional Infrastructure Governance

 The infrastructure financing gap in the Global South exceeds $1 trillion annually, with the cumulative gap projected to surpass $15 trillion by 2040. Traditional financing models often lead to unsustainable debt——debt service payments across Global South countries have reached their highest levels in 30 years, with many countries spending more on debt service than on addressing the climate crisis. Meanwhile, the "debt trap" discourse has dominated international舆论, but a 2025 study by the UK-based NGO "Debt Justice" covering 88 economies revealed that between 2020 and 2025, 39% of low-income countries' external debt service payments flowed to commercial lenders outside China, 34% to international multilateral institutions, and only 13% to China. This data reveals a fact obscured by public discourse: the structural root of the Global South debt crisis lies not in any single bilateral creditor, but in the fragmented international financial system itself. Based on the eight-dimensional framework of Prim-Lex Theory——Prim-Unity·Prim-Fire (energy metabolic efficiency of infrastructure projects), Two Principles·Yin-Yang (dynamic balance between development needs and debt servicing capacity), Three Realms·GC⁴A (cross-scale integration from international initiatives to national planning to project implementation), Four Phenomena·Four Colors (four-phase differentiated governance across the infrastructure project lifecycle), Five Elements·Five Models (coupling of metabolic deficit, debt phase-transition, spatial zoning, infrastructure balance sheet, and systemic resilience), Six Dimensions·Six Directions (spatial synergy and regional connectivity of cross-border infrastructure), Seven Luminaires·Seven Rhythms (multi-period synchronization of investment cycles and debt repayment cycles), and Eight Trigrams·Eight Information (entropy governance of infrastructure financing information networks)——this paper constructs, for the first time, an eight-dimensional quantitative assessment system for Global South infrastructure finance. Using three empirical anchors——the Programme for Infrastructure Development in Africa (PIDA), the Asian Infrastructure Investment Bank (AIIB) financing practices, and Belt and Road infrastructure projects——this paper demonstrates the application pathway of the eight-dimensional framework in identifying "critical windows" and "debt phase-transition points" in infrastructure finance, providing a quantifiable, programmable, and auditable mathematical language and governance tool for the transition of Global South infrastructure finance from "debt traps" to "eight-dimensional infrastructure governance."