By early 2015, mobile payments represented a major new opportunity but there was no dominant system and competing standards posed issues. Mobile payments accounted for $52 billion in 2014 and were expected to reach $67 billion in 2015. However, lack of compatibility between systems and uncertainty over which might dominate created obstacles to adoption. Industries with network effects like mobile payments often coalesce around a single dominant design, as the more a technology is adopted, the more valuable it becomes through learning and network effects. This can create self-reinforcing dominance regardless of a technology's initial quality.