It’s a bit like saying, in 1911, that given the choice between petroleum companies, everyone is going to choose Standard Oil, to which the answer is a resounding yes, of course they will.

Ask anybody in much of the Midwest where they will choose to buy groceries and they will answer Walmart.

This kind of reasoning is not an argument against the philosophy behind antitrust regulations. Rather, it is emblematic of the situation that monopolies create for themselves, by using their economies of scale to create pricing that cannot reasonably be expected to lose any competition over customers.

The same economies of scale benefit consumers and the economy as a whole as long as the business behaves in a manner consistent with the shared values of society. As soon as they decide to behave differently, though, society is at the mercy of a monopoly because they have consumed the entire market.