@techreport{ w10005,
 title = "Concavity of Utility, Concavity of Welfare, and Redistribution of Income",
 author = "Louis Kaplow",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "10005",
 year = "2003",
 month = "September",
 URL = "http://www.nber.org/papers/w10005",
}