The most expensive thing about being a developing country is not poverty. It is the interest rate charged on the money borrowed to fight it.
If 94 developing country governments, including Nigeria, could borrow at the same interest rates as those in developed economies, they could collectively save around $500 billion a year in interest payments, according to a new report by the United Nations Conference on Trade and Development titled "Financing Development: External Flows of Financial Capital to Developing Countries and Their Cost."
The scale of the opportunity is best understood through what that money could build. UNCTAD estimates that $500 billion in annual interest savings could finance approximately 375,000 new schools each year serving around 375 million students, fund more than 1.63 billion children through minimum dietary diversity feeding schemes, or support over 1.29 million primary healthcare centres.
The numbers behind the crisis are equally vivid. Government interest payments in developing countries rose 102% between 2014 and 2024, while government revenues increased only 39%. Interest payments grew 2.6 times faster than revenues, with 73% of developing countries experiencing a decline in fiscal space between 2018 and 2024 as rising interest costs crowded out spending on schools, hospitals, infrastructure, and clean energy.
Africa sits at the sharp end of this structural inequality. Africa received just 10% of external financial inflows to developing countries between 2014 and 2024, despite accounting for 22% of the developing world's population. Since 1990, the continent accounted for only 14% of sovereign bond issuances and just 11% of issuance value. Only 17 African countries accessed international bond markets over the past decade. Although borrowing conditions improved in 2025, average sovereign bond yields for developing countries remained elevated at 5.7%, compared with around 5% before the COVID-19 pandemic, with frontier market economies and African countries continuing to face borrowing costs close to 8%.
The Nigerian dimension is not hypothetical. The Federal Government is projected to spend approximately $11.6 billion servicing debt in 2026, consuming nearly half of projected revenue and leaving less than a naira in two for everything else. Between 2018 and 2024, 99 developing countries, home to 5.5 billion people, saw rising interest payments reduce the share of government revenue available for development spending.
UNCTAD's prescriptions are structural rather than aspirational. Reducing external borrowing costs will require strengthening macroeconomic frameworks, improving public debt management capacity, expanding domestic and local currency financing, diversifying the investor base, improving debt transparency, and deploying innovative financing tools such as green bonds and debt-for-development swaps. A debt swap in Côte d'Ivoire, the report notes, is expected to generate net present value savings of €60 million, with €40 million earmarked for the construction of 30 schools serving about 30,000 students, a small but replicable example of what the architecture could deliver at scale.
Developing countries received almost $1.5 trillion in new external financial inflows in 2024, yet financing remains far below what is needed to achieve the Sustainable Development Goals, with an annual financing gap estimated at around $4.3 trillion.
The $500 billion figure in UNCTAD's report is not a projection. It is the cost, paid annually, of a global financial architecture that prices risk in developing countries as though their governments are structurally less creditworthy than rich ones, regardless of economic fundamentals. For Nigeria, already spending over half its revenue on debt service, and for the 73% of developing countries that have lost fiscal space in the past six years, that premium is not just expensive. It is the single largest obstacle standing between today's macro stabilisation and tomorrow's development.
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