44 IZA Discussion Papers
IZA Discussion Paper No. 14142
IZA Discussion Paper No. 13956
IZA Discussion Paper No. 13737
IZA Discussion Paper No. 13733
IZA Discussion Paper No. 13657
IZA Discussion Paper No. 13555
IZA Discussion Paper No. 13408
IZA Discussion Paper No. 13131
IZA Discussion Paper No. 12924
forthcoming in: The Economic Journal
IZA Discussion Paper No. 12770
IZA Discussion Paper No. 12541
heavily revisied version forthcoming in the Economics of Innovation and New Technology
IZA Discussion Paper No. 12327
IZA Discussion Paper No. 12293
IZA Discussion Paper No. 12292
IZA Discussion Paper No. 12259
IZA Discussion Paper No. 12063
IZA Discussion Paper No. 12006
IZA Discussion Paper No. 12006
IZA Discussion Paper No. 12006
IZA Discussion Paper No. 11787
published in: Economics of Education Review, 2018, 67, 137-147