3 IZA Discussion Papers
IZA Discussion Paper No. 14683
published in: Journal of Public Economics, 2022, 206, 104577
IZA Discussion Paper No. 9606
revised version published in: American Economic Review, 2018, 108 (2), 393 - 418
IZA Discussion Paper No. 7390
substantially revised version available as IZA DP 9606