This document discusses the emerging battle in mobile payments in early 2015. While over 6 billion people had mobile phones at the time, there was no dominant mobile payment system and competing standards were vying for adoption. Mobile payments accounted for $52 billion in transactions in 2014 and were expected to grow. However, lack of compatibility between systems posed obstacles to adoption. The document then discusses why dominant designs emerge in markets, noting that network effects can create self-reinforcing mechanisms that increase the dominance of one technology over others, regardless of technical superiority.