The New York Times and Frontline have put together a joint series on the credit card industry , and the latest article runs in today's Times. Andrew Martin writes about how Visa took the lead in the debit card game by pushing prices up: Competition, of course, usually forces prices lower. But for payment networks like Visa and MasterCard , competition in the card business is more about winning over banks that actually issue the cards than consumers who use them. Visa and MasterCard set the fees that merchants must pay the cardholder’s bank. And higher fees mean higher profits for banks, even if it means that merchants shift the cost to consumers. Seizing on this odd twist, Visa enticed banks to embrace signature debit — the higher-priced method of handling debit cards — and turned over the fees to banks as an incentive to issue more Visa cards. At least initially, MasterCard and other rivals promoted PIN debit instead. As debit cards became the preferred plastic in American wallets, Visa has turned its attention to PIN debit too and increased its market share even more. And it has succeeded — not by lowering the fees that merchants pay, but often by pushing them up, making its bank customers happier. Read How Visa, Using Card Fees, Dominates a Market here .