2 IZA Discussion Papers
IZA Discussion Paper No. 9041
revised version published in: Experimental Economics 19(4), December 2016, 287-712; doi: 10.1007/s10683-015-9465-9
IZA Discussion Paper No. 3064
published in: Journal of Economic Behavior and Organization, 2008, 67 (3-4), 794 - 809