Mastercard and Visa credit, debit, and prepaid cards issued in the U.S. generated $4.326 trillion in purchase volume (spending at merchants) in 2016, an increase of 9.5% over 2015. All consumer and commercial card products are included in that amount. Purchase volume increased 10.9% on Visa cards. Mastercard purchase volume grew by 6.4%. Visa’s market share versus Mastercard climbed to 69.68% of spending at merchants last year, up from 68.79% in 2015. Combined purchase volume for Mastercard and Visa credit cards reached $2.242 trillion, an increase of 12.4%. For the third year in a row, c...