I feel we collectively misinterpret what the problem with single trader situations are. There being a monopoly is not the problem, the problems are always anti

I feel we collectively misinterpret what the problem with single trader situations are. There being a monopoly is not the problem, the problems are always anti trust behaviour i.e. not co-operating with the market for improvement, closing of competition by some behaviour that is not beneficial to the market. Highly regulated markets tend to do this due the difficulty in disrupting such a market, you need to play by the existing rules and that leaves little room for manoeuvre against the incumbents, the incumbents are free from anti trust because the rules are set by the authorities, often at the behest of the incumbents of course.