RDP 2009-02: Competition Between Payment Systems Equation (20)

f i c , * * f i c / M D i , ~ j m f i c , * . MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOzamaaDa aaleaacaWGPbaabaGaam4yaiaacYcacaGGQaGaaiOkaaaakiabggMi 6kaadAgadaqhaaWcbaGaamyAaaqaaiaadogaaaGccaGGVaGaamytai aadseadaqhaaWcbaGaamyAaiaacYcacaGG+bGaamOAaaqaaiaad2ga aaGccqGHLjYScaWGMbWaa0baaSqaaiaadMgaaeaacaWGJbGaaiilai aacQcaaaGccaGGUaaaaa@4D8F@