The 4F Crisis in the World: Fiscal Constraints, Fertilizer Access, and Food Security Vulnerabilities in Developing Nations

Abstract

Synthetic fertilizer is among the least visible foundations of modern food security, and its availability is increasingly set by fiscal and geopolitical forces rather than by agronomy. This paper introduces the "4F crisis", a compound vulnerability in which fiscal constraints, fertilizer access, food security, and the fragility of institutions and ecosystems reinforce one another in developing nations. The paper is an analytical, PRISMA-ScR-informed scoping review. It synthesizes evidence on fertilizer use and productivity, input subsidy programmes, sovereign debt and fiscal space, input price shocks, climate and flood hazards, health and social inequality, and the geopolitics of supply chains. A comparative lens contrasts sub-Saharan Africa, South Asia, and East Asia. The synthesis supports five findings. First, low and erratic fertilizer use in much of Africa is mainly a problem of affordability, delivery, and economic rationality, not of ignorance. Second, subsidy programmes have delivered real but modest and costly returns, and their design, not their existence, is the decisive variable. Third, debt service and volatile commodity prices squeeze the fiscal space that input support requires, and the squeeze arrives when shocks are largest. Fourth, climate hazards, particularly floods, destroy the returns on fertilizer investment and strain the same budgets. Fifth, health, social, and epistemic inequalities shape who benefits from any policy. The paper concludes with a counter-cyclical, multi-level governance framework and six testable propositions for future research.