3 IZA Discussion Papers
IZA Discussion Paper No. 9991
revised version published in: Research Policy, 2020, 49 (1), 103861
IZA Discussion Paper No. 9429
revised version published in: Regional Science and Urban Economics, 2019, 77, 87–103.
IZA Discussion Paper No. 7762
published in: Quarterly Journal of Economics, 2015, 130 (4), 1781–1824