“…Katz/Shapiro, 1985, p. 424, Roson, 2005, p. 144, Schmalensee, 2002, p. 106, Armstrong, 2006, p. 669, Dewenter, 2006, p. 58 f., Dewenter/Haucap, 2009 cf. Dewenter, 2007, p. 8, Dewenter/Haucap, 2009, p. 39 f., Wright, 2004, p. 47, Evans, 2010 cf. Rochet/Tirole, 2003p.…”