Multilateral development banks (MDBs) are an innovative institutional model to channel financing and knowledge to developing countries. In Latin America, the balance of forces between competition and collaboration among MDBs and other sources of development finance have formed a system that is decentralized and client-oriented. The author analyzes three types of relationships between MDBs to show areas of strength in their operations and future potential, using a great amount of quantitative data from the annual reports and financial databases of MDBs that the FORO Nacional Internacional research program has been tracking periodically.