Robert Cull is a Lead Economist in the Finance and Private Sector Development Team of the World Bank's Development Research Group

Asli Demirgüç-Kunt is Director of Development Policy in the World Bank's Development Economics Vice Presidency and Chief Economist of the Financial and Private Sector Development Network (FPD). She is the coeditor of Financial Structures and Economic Growth: A Cross-Country Comparison of Banks, Markets, and Development (MIT Press, 2001).

Jonathan Morduch is Professor of Public Policy and Economics at New York University's Wagner Graduate School of Public Service. He is the coauthor of The Economics of Microfinance (MIT Press) and Portfolios of the Poor: How the World's Poor Live on $2 a Day.