This thesis addresses theoretical and empirical questions related to network economics. In particular, it analyze network effects and switching costs in the mobile telecommunications industry. The first chapter analyzes competition in a two-period differentiated-products duopoly in the presence...

The German apprenticeship system has often been considered a role model for vocational education. But recent shortages in apprenticeship positions have led to a renewed debate about appropriate training policy. At present, there are renewed calls to introduce a training levy scheme, which would...