That's definitely a problem in the limit. However, we are nowhere close to that limit: our economy now mostly consists of vertically-integrated monopolies and

That's definitely a problem in the limit. However, we are nowhere close to that limit: our economy now mostly consists of vertically-integrated monopolies and oligopolies. Just think about, say, Comcast, which is simultaneously the most hated firm in America and yet subject to neither government regulation nor market competition. Among simple and easy slogans for solving our problems, "break them all up" is actually a pretty good one.