Daniel Cracau University of Magdeburg, Faculty of Economics and Management, Chair in E-Business   Universitaetsplatz 2 Magdeburg, Saxony Anhalt 39106 Germany   cracau@ovgu.de   http://www.e-business.ovgu.de/ebusiness/en/Our+Team/Daniel+Cracau.html           JEL Areas: D4 : Market Structure and Pricing: General C7 : Game Theory and Bargaining Theory:General