[gbear605]

You could have a theory of antitrust that allows for both rules - if a company is across multiple fields of business or if a company is too much of a single field, it gets split up. So Standard Oil and Ma Bell get split up for controlling too much of their industries and using it in anti-consumer practices, and Amazon gets split up (AWS vs everything else) because it’s inherently too large and it’s better for the economy for them to be split up.

[clairity]

of course, but i'd argue that too much of a single field is usually a case of a company that's actually in multiple businesses (see the mcdonald's example in a sibling thread).

my simplified perspective is a melding of the brandeisian (big is bad) and the chicago schools (economic efficiency for the win!), touched on in the article, so i certainly have no problems with synthesis in matters of antitrust. =)