Who Connects Global Aid? The Hidden Geometry of 10 Million Transactions

Abstract

The global aid system functions as a complex and evolving ecosystem; yet widespread understanding of its structure remains largely limited to aggregate volume flows. Here we map the network topology of global aid using a dataset of unprecedented scale: over 10 million transaction records connecting 2,456 publishing organisations across 230 countries between 1967 and 2025. We apply bipartite projection and dimensionality reduction to reveal the geometry of the system and unveil hidden patterns. This exposes distinct functional clusters that are otherwise sparsely connected. We find that while governments and multilateral agencies provide the primary resources, a small set of knowledge brokers provide the critical connectivity. Universities and research foundations specifically act as essential bridges between disparate islands of implementers and funders. We identify a core solar system of 25 central actors who drive this connectivity including unanticipated brokers like J-PAL and the Hewlett Foundation. These findings demonstrate that influence in the aid ecosystem flows through structural connectivity as much as financial volume. Our results provide a new framework for donors to identify strategic partners that accelerate coordination and evidence diffusion across the global network.

Figures (7)

• Figure 1: Global distribution of 10 million aid transactions from 1967 to 2025. Darker regions indicate higher transaction density on a logarithmic scale. This reveals the geographic footprint of the 2,456 publishing organisations in the International Aid Transparency Initiative (IATI) registry. While activity is global it is highly clustered around specific regional corridors in East Africa and South Asia with India and Bangladesh representing massive high-frequency hubs.
• Figure 1: Evolution of aid instruments (1967–2025). Longitudinal analysis of deal counts and instrument types (grants, loans, equity) demonstrating the increasing complexity and scale of the system over five decades.
• Figure 2: The hidden geometry of the aid ecosystem. UMAP dimensionality reduction projects high-dimensional network embeddings into 2D space to reveal functional clusters defined by two primary axes. The horizontal axis separates Humanitarian actors (left) from long-term Development institutions (right). The vertical axis differentiates Funders (top) from Implementers (bottom). This orthogonal arrangement creates four distinct quadrants populated by exemplars such as OCHA (Humanitarian Funder), Save the Children (Humanitarian Implementer), UNDP (Development Funder) and Chemonics (Development Implementer). The analysis also highlights the strategic position of connectors like J-PAL and The Hewlett Foundation which sit near the origin and bridge these functional zones.
• Figure 2: The Hewlett Foundation Aid Graph (US$1.7Bn, n=3,494). The diagram illustrates the Foundation's support of 289 diverse entities, highlighting a strategic alignment with highly central actors in the global aid ecosystem. The network includes twelve top-100 ranked organizations, such as GlobalGiving, J-PAL, and the International Rescue Committee, bridging the gap between broad-based support and high-impact central nodes.
• Figure 3: The solar system architecture of global aid. Organisations are ranked by centrality (inner rings) and sized by transaction volume. While the core inner ring contains the expected financial giants (large nodes), it also reveals a distinct class of knowledge brokers (small nodes). Organisations such as J-PAL and The Hewlett Foundation occupy central positions despite having significantly smaller financial footprints than bilateral agencies. This highlights their strategic role as connectors rather than just funders.