About the Authors

Mario Songane

Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Validation, Visualization, Writing – original draft, Writing – review & editing

mario.songane@unifr.ch (MS); volker.grossmann@unifr.ch (VG)

Affiliation Department of Economics, University of Fribourg, Fribourg, Switzerland

Volker Grossmann

Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing

mario.songane@unifr.ch (MS); volker.grossmann@unifr.ch (VG)

Affiliations Department of Economics, University of Fribourg, Fribourg, Switzerland, Institute for the Study of Labor (IZA), Bonn, Germany, CESifo, Munich, Germany

Competing Interests

The authors have declared that no competing interests exist.