DAVID MCKENZIE is a Lead Economist in the Development Research Group, Finance and Private Sector Development Unit. He received his B.Com.(Hons)/B.A. from the University of Auckland, New Zealand and his Ph.D. in Economics from Yale University. Prior to joining the World Bank, he spent four years as an assistant professor of Economics at Stanford University. His main research is on migration, enterprise development, and methodology for use with developing country data. He has published more than 100 articles in journals such as the American Economic Review, Quarterly Journal of Economics, Science, Review of Economics and Statistics, Journal of the European Economic Association, Economic Journal, American Economic Journal: Applied Micro, Journal of Econometrics, and all leading development journals. He is currently on the editorial boards of the Journal of Development Economics, the World Bank Economic Review, and Migration Studies. He is also a co-founder and regular contributor to the Development Impact blog.