1. Institute of MarketingTechnische Universität Braunschweig, Abt‐Jerusalem‐Straße 4 Braunschweig Germany
2. Aston Business SchoolMarketing and Strategy Group, Aston Triangle Birmingham UK
3. Chair of Services Management and Institute of Automotive Management and Industrial ProductionTechnische Universität Braunschweig, Mühlenpfordtstraße. 23 Braunschweig Germany