When a Monopoly Is the Only Reasonable Situation in the Market?

Also realy important is that, company who has this monopoly rights in country, they have great chance to get lower average total costs.
It is hard to say that monopoly is the only reasonable situation in the market, becouse there are a lot of situation, and each other are different, so at the first we have to look at final position, for who is it better, and that we could only answer about it.
…