you need to have in mind things like monopolies, and cartels are usually related to government interventions with things like patents and permissions. In a real free market, having a monopoly would be almost impossible.
I think you are implying something that makes no sense, why would someone want to have dying and miserable customers? Why would I want to hurt my customers? If I were selling something, I want my customers to be happy, healthy and prosperous. Otherwise I will end up bankrupting my business because I won’t have any customers.
about the no damage rule, I think in a libertarian place there would be enough voluntarily supported charity organizations and I am sure every needed person would find support.
Ps: I still wonder why would someone want to make water so expensive decreasing the prosperity of the community? That makes no sense to me. I want everyone to thrive.
The artificial oligarchical hoarding of Steem is a marked example of doing so, even causing Steemit to retain less than 10% of accounts that were created in 2016, including bots and multiples.
It makes no sense - unless you're the one with the resource, and maximizing your wealth is your only concern. Cash is king.