You dont have to imagine, just see what happen in relatively weak governments: Drug cartels, war lords, mafia syndicates, union busting, etc, etc. This is just

You dont have to imagine, just see what happen in relatively weak governments: Drug cartels, war lords, mafia syndicates, union busting, etc, etc. This is just a hunch but I wouldn't be surprised if the biggest part of actual monopolies is enforced by illegal means.