J. Edward Taylor is Professor of Agricultural and Resource Economics and Director of the Rural Economies of the Americas Program (REAP) at the University of California, Davis. He was coeditor of the American Journal of Agricultural Economics and has written extensively on the economy-wide impacts of agricultural and development policies. His publications include Beyond Experiments in Development Economics: Local Economy-wide Impact Evaluation; Village Economies: The Design, Estimation, and Use of Villagewide Economic Models; and Worlds in Motion: Understanding International Migration at the End of the Millennium. Listed in Who's Who in Economics, he has advised a number of foreign governments and international development agencies on matters related to economic development. His development economics work spans four continents. Travis J. Lybbert is Associate Professor of Agricultural and Resource Economics at the University of California, Davis. He has published research in applied microeconomics on topics ranging from poverty dynamics, climate change, and childhood nutrition to technology adoption, intellectual property, and innovation policy. As a collaborator with students and other researchers, he has lived and worked on projects in India and many countries in sub-Saharan Africa, North Africa, and Europe.