This isn't an investigation into whether these companies are monopolies. This is an antitrust investigation. Are these companies being anti-competitive? So tak

This isn't an investigation into whether these companies are monopolies. This is an antitrust investigation. Are these companies being anti-competitive? So take the e-reader market. Amazon was able to undercut everyone else on price by a wide margin. A question could be asked whether their breadth of business allowed them to sell at a loss for long enough to kill off competition. Maybe, or maybe not, but was that their intent? I'm not sure how much intent matters in these types of cases. And I'm sure there's more here that could be perceived as anticompetitive. I'm just picking some obvious example of where an investigation might be useful.