@techreport{NBERw12505,
 title = "A New Framework for the Analysis of Inequality",
 author = "Flavio Cunha and James J. Heckman",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "12505",
 year = "2006",
 month = "September",
 URL = "http://www.nber.org/papers/w12505",
}