@techreport{NBERw15155,
 title = "Productivity Differences Between and Within Countries",
 author = "Daron Acemoglu and Melissa Dell",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "15155",
 year = "2009",
 month = "July",
 URL = "http://www.nber.org/papers/w15155",
 abstract = {We document substantial within-country (cross-municipality) differences in incomes for a large number of countries in the Americas. A significant fraction of the within-country differences cannot be explained by observed human capital. We conjecture that the sources of within-country and between-country differences are related. As a first step towards a united framework, we propose a simple model incorporating both differences in technological know-how across countries and differences in productive efficiency within countries.},
}