“…In 2009 about 60% of German youths aged between 16 and 24 years entered vocational training (Gericke et al, 2011). 1 and Ryan, 2011) and a change of occupation (firm) may imply a loss of the occupation-(firm-) specific human capital acquired through apprenticeship training (Kambourov and Manovskii, 2008;Gathmann and Schönberg, 2010). On the other hand, firms may use the apprenticeship as a screening device for young workers, and they may only retain those apprentices after graduation who perform well (Euwals and Winkelmann, 2002;Werwatz 2002;von Wachter and Bender, 2006). Graduates from apprenticeship may search for better job offers as a form of career progression (Topel and Ward, 1992;von Wachter and Bender, 2006;Fitzenberger and Spitz-Oener 2004), and non-training firms may make attractive job offers to well trained graduates from apprenticeship, i.e.…”