[ghostwriter]

> Unregulated markets can result in a number of situations that limit people's opportunities significantly. Monopolies are a clear example and various externalities can also have significant impacts on commerce.

Could you name an existing stable monopoly that is not a state-granted monopoly (i.e. a monopoly, that is not associated with government regulations, subsidies, grants, medallions, quotas and other things that have to do with regulating the market by the government), yet is capable of preventing other players from entering the same market?

[shkkmo]

> Could you name an existing stable monopoly that is not a state-granted monopoly.

No, because we have regulations to prevent them and break them up.

There are a number of entities that are clearly restraining their classically monopolistic behavior BECAUSE of the regulations such as Microsoft, Google and Amazon.