4 IZA Discussion Papers
IZA Discussion Paper No. 13105
IZA Discussion Paper No. 8877
published in: Journal of Comparative Economics, 2017, 45(3), 563-581
IZA Discussion Paper No. 2510
revised version published in: Journal of Law and Economics, 2010, 53 (1), 95-136
IZA Discussion Paper No. 2430
published in: R. Vaubel and P. Bernholz (eds.), Political Competition and Economic Regulation, London: Routledge 2007