@techreport{NBERw13345,
 title = "Uncovering the American Dream: Inequality and Mobility in Social Security Earnings Data since 1937",
 author = "Wojciech Kopczuk and Emmanuel Saez and Jae Song",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "13345",
 year = "2007",
 month = "August",
 URL = "http://www.nber.org/papers/w13345",
}