4 IZA Discussion Papers
IZA Discussion Paper No. 11716
revised version here
IZA Discussion Paper No. 11114
revised version published in: Industrial and Labor Relations Review, 2020, 73(3), 730-767.
IZA Discussion Paper No. 10385
IZA Discussion Paper No. 10072
revised version published in: Journal of Applied Econometrics, 2019, 34, 707-723. Open access: https://onlinelibrary.wiley.com/doi/10.1002/jae.2711