[ameister14]

The case mentioned a lot in the article, that of Standard Oil, is one where prices were kept very low, and continuously lowered through improved efficiency. Even when they had 90% market share, Standard Oil kept prices low for consumers.

There's a real argument to be made about the efficiency of monopoly, particularly where a destructive pattern of competitive behavior had been the norm previously. Rockefeller made that argument, albeit unsuccessfully at the time, but I don't think it is any less compelling for that.

Even if you allow that Amazon is a monopoly, competition is not intrinsically good. Competition is generally good where it improved the options and prices available for the consumer. That wasn't really the case with big publishing companies before.