First Author:   Hans Dietrich Institute for Employment Research (IAB) hans.dietrich@iab.de   Weddigenstr. 20-22 Nuernberg, 90478, Germany   +49 911 179 3263(Phone) +49 911 179 3263(Fax) http://www.iab.de/123/section.aspx/Mitarbeiter/26 Second Author: Hans-Dieter Gerner Institute for Employment Research (IAB) hans-dieter.gerner@iab.de   Nuernberg, 90478, Germany   +49 911 179 8114(Phone)   http://www.iab.de/123/section.aspx/Mitarbeiter/507