In 2023, the OECD estimated the annual financing deficit for the Sustainable Development Goals at 4.2 trillion dollars. That same year, according to the OECD, private finance mobilized through official development interventions reached 70 billion dollars globally, and according to Convergence, tracked blended finance transactions represented 15 billion dollars. These flows, even if rising, account for only approximately 1.7% of the estimated need.

This figure is not a cyclical failure. It is the verdict of a decade of experimentation.

Since the Paris Agreement and the adoption of the 2030 Agenda, governments, multilateral banks, and international organizations have multiplied financial architectures designed to direct private capital toward developing countries. Green bonds, catalytic funds, partial credit guarantees, junior tranches absorbing first losses: the toolkit is comprehensive. The flows, however, are not following. Understanding why, and under what precise conditions this equation can change, is one of the most important economic questions of the decade.

The Essentials

  • According to the OECD, private finance mobilized through official development interventions reached 70 billion dollars in 2023, against an annual need estimated at 4.2 trillion for the SDGs.
  • Development banks (World Bank, EIB, AfDB) are deploying increasing risk-sharing mechanisms, but their leverage effect remains below initial projections.
  • The principal obstacle is not private investors’ risk aversion: it is the structural mismatch between the projects proposed and the criteria of liquidity, size, and predictability required by large asset managers.
  • Upper-middle-income countries absorb 80% of blended finance flows, leaving the most fragile economies, where SDG needs are most acute, largely unexploited.
  • New approaches—development-linked impact bonds indexed to development indicators, pooled regional funds—show encouraging preliminary results but remain at pilot scale.

The Calculation Asset Managers Actually Make

Imagine a Canadian pension fund managing 200 billion dollars for retirees whose first disbursements arrive in eight years. Its manager seeks liquid, rated, exchange-traded assets with sufficient cash flow predictability to cover its future obligations. A drinking water infrastructure project in Mozambique, even partially guaranteed by the World Bank, checks none of these boxes. This is not a question of bad faith. It is a question of mandate.

This is where the fundamental misunderstanding that has structured the debate for ten years resides. The dominant thesis in development circles posits that private capital is abundant, that needs are immense, and that intelligent public intervention would suffice to bring supply and demand together. The OECD itself long described blended finance as a lever capable of mobilizing “four to five dollars of private capital for every dollar of public investment.” Its own evaluation report, however, significantly revised this leverage effect downward in least-developed countries.

Economist Philippe Chalmin, a specialist in commodity markets and rigorous observer of long economic cycles, formulated a caveat that proves pertinent here: markets have their own allocation logics, and claiming to “direct” them from outside without modifying fundamental incentive structures amounts to bailing water with a sieve. The state can create conditions, not substitute its will for the risk-adjusted return calculations of private managers.

These calculations are precise. BlackRock, Vanguard, and major sovereign wealth funds do not allocate their capital according to a political agenda. They do so according to quantitative models that integrate country risk, exit liquidity, minimum ticket size, and correlation with the rest of the portfolio. A 20-million-dollar project in Tanzania, even with an African Development Bank guarantee, remains too small for a global asset manager to devote the necessary analysis time. The fixed cost of due diligence is the same as for a two-billion-dollar project.

A Decade of Tools, Results Below Expectations

Blended finance instruments were not born yesterday. The International Finance Corporation (IFC), the commercial arm of the World Bank Group, has been experimenting with public-private co-investments in emerging markets since the 1990s. What changed after 2015 is the ambition to scale up.

The architecture has become richer. Partial credit guarantees cover a portion of potential losses to discourage investor risk aversion. “First loss” tranches, where public money absorbs the first losses before the private sector is touched, seek to make the risk-return profile acceptable. Impact bonds (social impact bonds, development impact bonds) index repayments to measurable results. The World Bank launched its Private Sector Investment Lab in 2023 precisely to diagnose blockages and design tailor-made solutions.

Results are mixed, according to data from Convergence’s “Blended Finance Funds and Facilities” report, which has tracked the entire market since 2015. Of the 200 billion dollars of cumulative blended finance flows between 2015 and 2023, 80% were directed toward upper-middle-income countries—Morocco, Vietnam, Colombia, Indonesia. These countries present stable regulatory environments, nascent local financial markets, and risk profiles that private investors are able to assess. Morocco, for example, has managed to combine logistical infrastructure and access to international financing to attract industrial investments at a scale few African neighbors have achieved.

The least-developed countries—where infant mortality remains high, where access to drinking water is lacking for hundreds of millions of people, where the SDGs are furthest from being achieved—receive approximately 6 to 7% of private finance flows mobilized through blended finance, according to the OECD and Convergence. The geography of money does not follow the geography of needs.

What Blocks Progress, and What Some Are Attempting to Unblock

Three structural obstacles emerge from analysis of transactions that did not materialize, documented by the G20 and several development banks.

The first is size. Large asset managers operate with minimum investment thresholds around 50 to 100 million dollars per transaction. The majority of SDG projects in low-income countries are smaller. Aggregation—pooling several small projects into a single vehicle—is technically possible but costly to structure and presupposes coordination between projects in different countries with incompatible regulatory frameworks.

The second is exit liquidity. A closed-end fund over ten years can invest in infrastructure in an emerging country. But if the secondary market does not exist, the manager cannot exit before maturity. This structurally excludes investors with short-term liquidity obligations—a significant fraction of global institutional savings.

The third is measurement. ESG funds have experienced notable growth in developed countries: according to the latest GSIA report (GSIR 2022, published in 2023), sustainable assets under management amount to 30.3 trillion dollars, down from the peak of 35.3 trillion in 2020 due to methodological revisions. But most of these funds invest in large listed companies in developed markets, not in sanitation projects in Niger. The “sustainable development” label is insufficient to orient flows toward the SDGs.

Experiments are responding to these obstacles with increasing precision. The IFC launched the MCPP (Managed Co-Lending Portfolio Program), which allows institutional investors to co-invest in a diversified portfolio of IFC loans, reducing concentration risk and offering improved liquidity. Since its launch in 2013, the program has mobilized more than 19 billion dollars from 18 partners, including Allianz and AXA, and total MCPP capacity is expected to exceed 25 billion by 2026. This is still modest at the scale of needs, but it is a mechanism that works and that is scaling up.

The African Development Bank developed its Room2Run program, which transfers credit risk from its portfolio to private investors via synthetic instruments, freeing up balance sheet capital for new loans. The original transaction, launched in September 2018, allowed for the transfer of 1 billion dollars of risk. In 2022, a new operation called “Room2Run Sovereign” was launched to free up as much as 2 billion dollars of additional lending capacity, with participation from the British government and London insurers. These innovations remain marginal to global flows, but they demonstrate that structures adapted to investor calculations can modify how private investors make decisions, provided they are designed with them, not for them.

The Entrepreneurial State and Its Real Limits

The fundamental question touches on the architecture of development financing as economists like Mariana Mazzucato have formulated it: the state should not merely “fill gaps” in the market, but actively shape the conditions under which the market operates. Applied to SDG financing, this thesis leads to envisioning development banks with expanded mandates, capable of orienting private flows through their own upstream investments.

The reasoning is attractive. However, it encounters a tension documented by Acemoglu and Johnson in their analysis of technological capture: when public institutions finance innovations or infrastructure without a mechanism for sharing gains, benefits tend to accumulate where capital is already concentrated. In blended finance, this translates into a paradox: the more generous public guarantees are, the more they attract projects that could have been financed without them, and the less funding remains available for projects truly not financeable by the market alone.

The answer to this paradox is not to abandon public intervention. It is to calibrate it precisely. The most effective development banks have learned to distinguish three categories of projects: those that can attract private capital with minimal guarantees, those that require substantial public risk-sharing, and those that will remain unfinanceable by the market regardless of the risk-sharing mechanism. For the latter, direct subsidy remains the only honest answer, and claiming otherwise amounts to maintaining an accounting illusion that diverts attention from necessary public financing.

A significant portion of the most critical SDG needs falls into this third category, according to the World Bank. These are global public goods—vaccination, basic sanitation, climate adaptation in the most vulnerable countries—whose financial return is structurally insufficient for a private investor, whatever incentive structures are put in place. Mobilizing them requires an increase in official development assistance flows. Yet, while ODA has progressed significantly, from 161 billion dollars in 2020 to a record 223.3 billion in 2023, it subsequently fell to 212 billion in 2024, as several major donors reduce their commitments.

What Can Still Change by 2030 and Beyond

The 2030 SDG horizon is already partially lost. UNDP estimated in 2023 that less than 15% of objectives would be achieved on time at the current pace. But the question of development financing does not end in 2030—it poses a structural question about the capacity of the international financial system to direct resources toward low-income economies in the decades that follow.

Two dynamics merit close monitoring. The first is the rise of sovereign wealth funds from Gulf countries—Abu Dhabi Investment Authority, Saudi Public Investment Fund, Qatar Investment Authority—which have geopolitical and diversification mandates that do not reduce to financial return alone. Their growing appetite for African infrastructure, observable since 2022, constitutes a new form of non-institutional blended finance that escapes classical development aid architectures. African countries that ambition to valorize their natural resources rather than export them raw already know these flows exist and seek to capture them on favorable terms.

The second is the emergence of high-integrity voluntary carbon markets, whose reform under Article 6 of the Paris Agreement could create an indirect financing mechanism for developing countries via the valorization of their ecosystem services. The potential remains very uncertain—voluntary carbon markets traversed a credibility crisis between 2022 and 2024—but the architecture is undergoing reconstruction, and several sub-Saharan African countries have already signed bilateral carbon cooperation agreements with Switzerland, Singapore, and Japan in this framework.

The real test of the next decade will not be whether blended finance can achieve its theoretical leverage objectives. It will be determining which developing countries manage to create the conditions—stable regulatory framework, controlled country risk, projects of sufficient size, nascent local financial markets—that make private finance possible for them. This long-term institutional work, invisible in development banks’ annual reports, is probably more determinant than any financial instrument.

The real question may not be how to direct global finance toward the SDGs. It is how countries most in need of capital build the credibility that makes them reachable by investors whose mandates, for now, structurally turn away from them.

Sources

  1. OECD, Reports on development finance and blended finance: https://www.oecd.org
  2. Convergence, “Blended Finance Funds and Facilities” (cumulative data 2015-2023), no verified direct link
  3. World Bank, Private Sector Investment Lab and SDG report 2023, no verified direct link
  4. Global Sustainable Investment Alliance, Global Sustainable Investment Review 2022, no verified direct link
  5. IFC, MCPP program (Managed Co-Lending Portfolio Program), no verified direct link
  6. African Development Bank, Room2Run program 2022, no verified direct link
  7. UNDP, SDG monitoring report 2023, no verified direct link
  8. OECD - Tracking Private Finance Mobilisation (2024)
  9. OECD - Global Outlook Financing for Development Report (Feb. 2025)
  10. UN - SDG Progress Chart 2023
  11. World Bank - Launch of Private Sector Investment Lab (June 2023)
  12. IFC - Official MCPP Page
  13. AfDB - Room2Run (Sept. 2018)
  14. OECD - Blended Finance in the LDCs 2019
  15. GSIA - Global Sustainable Investment Review 2022 (Nov. 2023)
  16. Convergence - Leverage Ratio Brief