Can new technology break Mastercard and Visa's duopoly?

Mastercard and Visa are the dominant global payment networks. Their systems allow you to tap your card to buy a coffee virtually anywhere in the world, and two seconds later you are walking away. It feels effortless, but behind that two-second transaction lies a complex global relay. Your bank confirms funds, the merchant's bank requests authorisation and fraud systems assess the risk.To most people, Mastercard (NYSE: MA) and Visa (NYSE: V) are little more than logos on cards. In reality, they r