1. Université Libre de Bruxelles (SBS-EM, CEB and DULBEA), Brussels, Belgium
2. Université Libre de Bruxelles (SBS-EM, CEB and DULBEA), Brussels, Belgium; Institute of Labor Economics (IZA), Bonn, Germany; Université catholique de Louvain (IRES), Louvain, Belgium; and UMONS (humanOrg), Mons, Belgium
3. National Bank of Belgium, Brussels, Belgium
4. Université Libre de Bruxelles (SBS-EM, CEB and DULBEA), Brussels, Belgium; and Institute of Labor Economics (IZA), Bonn, Germany