$Amazon (AMZN.US)$$Visa (V.US)$$MasterCard (MA.US)$ Amazon i...

$Amazon (AMZN.US)$ $Visa (V.US)$ $MasterCard (MA.US)$ Amazon is considering switching its popular co-branded credit cards to mastercard amid simmering tensions with Visa. Visa plays a unique role in payments. Like Mastercard Inc., the company sets fees for merchants to swipe their cards. While the banks that issue the cards receive the bulk of the fees, Visa has long faced criticism from merchants over its rising costs. If Amazon does change, will it affect your spending？