General purpose and private label credit, debit, and prepaid cards generated $5.165 trillion in payments for goods and services in 2014. Processing fees, including interchange paid by U.S. merchants to handle that business, were $78.09 billion, up from $72.44 billion merchants paid one year before when card payments were $4.768 trillion. The weighted average of fees as a percentage of purchase volume from Visa and MasterCard credit, debit, and prepaid cards, American Express credit and prepaid cards, Discover credit, debit, and prepaid cards, EFT system PIN-based debit cards, and private la...