@techreport{NBERw8933,
 title = "The World Distribution of Income (estimated from Individual Country Distributions)",
 author = "Xavier Sala-i-Martin",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "8933",
 year = "2002",
 month = "May",
 URL = "http://www.nber.org/papers/w8933",
}