“…Data sources: Visa USA, Federal Reserve Board, Evans and Schmalensee (2005) and Frankle (2006). 6 For example, Schmalensee (2002), Rochet and Tirole (2002), Wright (2003Wright ( , 2004, Schwartz and Vincent (2006), Hayashi (2006), McAndrews and Wang (2008). 7 Payment card systems are not the only case of such two-sided markets.…”