American Express, Discover, Mastercard and Visa credit, debit and prepaid cards combined generated 61.77 billion transactions for purchases of goods and services from January 1 through June 30, 2021. Purchase transactions grew 19.0% in 2021 over the first six months of 2020. Mastercard and Visa debit cards combined accounted for 63.75% of all debit and credit purchase transactions, an increase from 63.02% for midyear 2020. Amex, Discover, Mastercard and Visa credit cards accounted for the other 36.25% of purchase transactions in the first six months of this year. That was down from 36.98% f...