His work uses various episodes in history to examine the economics of contracts and organizations and the economics of migration. He has written about the economics of the Israeli kibbutz, business partnerships, marriage markets, inter-religious competition, and internal and international migration, among other topics. Abramitzky received his PhD from Northwestern University and his BA from the Hebrew University.Robert J. Barro is Paul M. Warburg Professor of Economics at Harvard University, a senior fellow of the Hoover Institution of Stanford University, and a research associate of the National Bureau