[MichaelZuo]

It's self correcting as customers will move to the competitors over time.

If it's one of the few business that has an absolute monopoly over a certain sector in a country, then the country will gradually weaken over time, until eventually it won't be able to resist a foreign competitor.

Or at least that's what market theory suggests. Of course the period of 'self-correction' could take a few months to a few centuries to fully play out, and simultaneously overlaps with all other market participants.