One might say that if one were completely ignorant of economics and economic history. There are no examples of long running monopolies unsupported by state power.

Define "supported" and "long"...

It would be nice for the people who are down voting you to provide a counter example.

The banking sector, Alcoa, big pharma, automotive, oil/gas energy, telecom, and even groceries. Anywhere you have rents being sought and reaped you have monopolistic power. Im excluding the remark about government supported because that's more of a corporation forcing the governments hand through threats.

When someone calls me ignorant I don't necessarily feel like replying.