Uber is actually not the best example of a natural global monopoly - because it needs to compete locally - most taxi rides are for local population. So there might be a natural monopoly (or duopoly) for a taxi app - but one per a metro area. This is different from AirBnB - where the app works truly globally. https://thinkgrowth.org/uber-is-going-to-0-and-benchmark-kno...