Beyond Risk and Return: Reconceptualizing Ratings and Blended Finance for Sustainable Development Impact
Year: 2026
Type: article
Study design: Systematic Review
Abstract: The global community faces an unprecedented challenge in financing the Sustainable Development Goals (SDGs), with an estimated annual gap exceeding $4 trillion in low- and middle-income countries. This systematic review examines how credit ratings, environmental, social, and governance (ESG) ratings, and blended finance mechanisms influence capital allocation for sustainable development and identifies critical gaps in their capacity to deliver measurable development impact. Following Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, a comprehensive search of academic databases yielded 25 peer-reviewed articles published between 2018 and 2025. The synthesis reveals that traditional rating frameworks prioritize short-term financial metrics over long-term development outcomes, creating structural biases against essential SDG investments. Blended finance, while conceptually promising for mobilizing private capital, faces significant challenges in scalability, impact accountability, and effectiveness in reaching highest-need contexts. Mobilization ratios consistently fall below expectations, transaction costs remain prohibitive, and impact measurement focuses on outputs rather than outcomes. The review identifies a fundamental disconnect between rating methodologies and blended finance objectives, with neither adequately incorporating development additionality or contextual factors. Findings suggest that achieving sustainable development at scale requires systemic reform: impact-adjusted rating frameworks that recognize long-term development investments, standardized blended finance platforms to reduce transaction costs, and robust accountability mechanisms linking financial terms to impact delivery. The review concludes that transforming ratings and blended finance into effective tools for sustainable development demands coordinated institutional innovation, policy reform, and fundamental reconceptualization of risk and value in development finance. Received: 19 March 2026 / Accepted: 30 April 2026 / Published: May 2026
Authors: Rony Azar, Abdallah Elias, Tejroi Naipaul
Institution: International Executive School
Subfield: Finance
Domain: Social Sciences
Open Access status: diamond
OpenAlex ID: W7160765426
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