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Trier Univ, Dept Management, Universitatsring 15, D-54296 Trier, Germany
Trier Univ, Inst Labour Law & Ind Relat European Union, Behringstr 21, D-54296 Trier, Germany
IZA, Bonn, Germany
CESifo, Munich, Germany Trier Univ, Dept Management, Universitatsring 15, D-54296 Trier, Germany