Bernhard Boockmann Centre for European Economic Research (ZEW )   Postfach 103443 Mannheim, 68034 Germany   boockmann@zew.de   http://www.zew.de/en/mitarbeiter/mitarbeiter.php3?action=mita&kurz=bbo           JEL Areas: J6 : Mobility, Unemployment, and Vacancies: General D7 : Analysis of Collective Decision-Making: General