Visa, Mastercard, American Express, and Discover credit, debit, and prepaid cards generated 46.07 billion purchase transactions from January 1 through June 30, 2017—up 2.25 billion or 5.1% over the first six months of 2016. Debit cards accounted for 61.16% of those transactions, down from 63.28% in 2016. Credit cards accounted for 38.84%, up from 36.72%. Visa debit cards generated 43.70% of all purchase transactions in the first six months of 2017, down from 44.83% in the same period the prior year. Visa credit cards generated 22.52% of all purchase transactions, up from 19.74%. Mas...