An argument that only works if it is possible to compete. Most "markets" seem to consolidate into monopolies at the same time as entry to that market is tightly

An argument that only works if it is possible to compete. Most "markets" seem to consolidate into monopolies at the same time as entry to that market is tightly controlled. Telco/Airlines/ISP/Music etc. Uber has different situations in different places, but to me it seems that they only have real competition in some cities in the US.