Michael Kremer, a Fellow of the American Academy of Arts and Sciences since 2003, is Gates Professor of Developing Societies in the economics department at Harvard University, a Senior Fellow at the Brookings Institution, and the cofounder and cochair of bread, the Bureau for Research and Economic Analysis of Development. He is cochair of the Center for Global Development's Policy Research Network working group on pull incentives for vaccines. He is also the author, with Rachel Glennerster, of "Strong Medicine: Designing Pharmaceutical Markets to Treat Neglected Diseases," which will appear la...