You don't have to have a monopoly to be monopolistic.

The Sherman Act says that any action by an individual, or conspiracy of a group of individuals, to "restrain trade" or seek a monopoly is illegal.

Monopolies aren't a prerequisite for antitrust action, they're the failure state when you should have acted sooner.

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	▲	vel0city 5 hours ago \| parent \| prev [-]
		Taco Bell is a monopoly because they restrain the trade of tacos because they ask me to take my taco truck elsewhere when I park in their parking lot to sell tacos. Never mind there are other places I can set up my truck, never mind there are tons of other taco shops, Taco Bell is a monopoly as now I need to go find a different corner to sell my tacos, they're restraining the trade of tacos. Everything is a monopoly these days. Its practically meaningless in these conversations.