American Express, Discover, Mastercard, and Visa general purpose consumer and commercial credit, debit, and prepaid cards issued in the United States combined with U.S. EFT network general purpose debit cards (Star, Pulse, Nyce, Interlink, Accel, and others) generated $6.081 trillion in purchase volume at merchants in 2017, an increase of 7.7% over 2016. Credit cards generated $3.352 trillion, an increase of 9.6% over the prior year. Debit and prepaid cards generated $2.729 trillion in purchase volume, an increase of 5.4%. Not included are private label credit cards such as store card...