@techreport{NBERw12549,
 title = "Poverty Traps, Distance, and Diversity: The Migration Connection",
 author = "Jeffrey G. Williamson",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "12549",
 year = "2006",
 month = "October",
 URL = "http://www.nber.org/papers/w12549",
 abstract = {Within-country ethnic diversity in high-wage immigrant nations is driven by long distance migration. This paper documents the migration-diversity connection for the first global century before 1914 and the second global century after 1950. It distinguishes between ethnic diversity among the foreign-born, between the foreign-born and native-born and for total populations using country-of-birth data. It exploits the polarization index made popular in the recent diversity-growth debate and exploits an emigration life cycle model to predict the connection. It also shows how policy matters.},
}