When is a monopoly illegal under the Sherman Act?

Question

Quizplus · Accepted Answer

A monopoly is illegal under the Sherman Act if it is acquired or maintained through prohibited means, such as through exclusionary or predatory practices that harm competition. Horizontal restraints, which are agreements between competitors to limit competition, can also be illegal under the Sherman Act, but they are not the only way in which a monopoly can be deemed illegal. Not all monopolies are illegal under the Sherman Act, as some may exist due to natural factors such as economies of scale. The Sherman Act specifically addresses monopolies and their potential harm to competition.

When Is a Monopoly Illegal Under the Sherman Act