Final answer:
An act does not need to substantially affect interstate commerce to violate antitrust law. The statement that an act must substantially affect interstate commerce to violate antitrust law is false.
Step-by-step explanation:
The statement that an act must substantially affect interstate commerce to violate antitrust law is false. The U.S. antitrust laws reach beyond blocking mergers that would reduce competition to include a wide array of anticompetitive practices. For example, it is illegal for competitors to form a cartel to collude to make pricing and output decisions, as if they were a monopoly firm. The Federal Trade Commission and the U.S. Department of Justice prohibit firms from agreeing to fix prices or output, rigging bids, or sharing or dividing markets by allocating customers, suppliers, territories, or lines of commerce. Therefore, an act does not need to substantially affect interstate commerce to violate antitrust law.