3 IZA Discussion Papers
IZA Discussion Paper No. 10754
revised version published in Economic Inquiry, 2018, 56 (3), 1512-1525
IZA Discussion Paper No. 4536
published in: American Economic Review, 2012, 102 (1), 469-503
IZA Discussion Paper No. 3939
published in: American Economic Review, 2011, 101 (2), 470-492