The Supreme Court on Monday ruled 5-4 against Apple in a case involving its signature electronic marketplace, the App Store, allowing iPhone users to move forward with an antitrust suit against the company. The iPhone users argued that Apple’s 30% commission on sales through the App Store is an unfair use of monopoly power that results in inflated prices passed on to consumers. Apple argued that only app developers, and not users, should be able to bring such a lawsuit. But the Supreme Court, in an opinion authored by Justice Brett Kavanaugh, rejected that claim.