43 IZA Discussion Papers
IZA Discussion Paper No. 3450
substantially revised version published in: Oxford Handbook on Economic Inequality, Oxford University Press, Oxford et al., 2009, 455 - 490
IZA Discussion Paper No. 1189
published in: Review of Economic Studies, 2009, 76 (2), 731-759
IZA Discussion Paper No. 273
published in: Economic Journal, 2006, 116 (511), 382-407