Many of the classic tying cases involved tied products that were common staples such as button fasteners, canned ink, dry ice, or salt. These products were sold in competitive markets, presumably at prices very close to cost. For most of them the most likely explanations for the tie were quality...

Are large digital platforms that deal directly with consumers “winner take all,” or natural monopoly, firms? That question is surprisingly complex and does not produce the same answer for every platform. The closer one looks at digital platforms the less they seem to be winner-take-all. As a...

The “monopoly” authorized by the Patent Act refers to the exclusionary power of individual patents. That is not the same thing as the acquisition of individual patent rights into portfolios that dominate a market, something that the Patent Act never justifies and that the antitrust laws...

Antitrust enforcers and its other defenders have never done a good job of selling their field to the public. That is not entirely their fault. Antitrust is inherently technical, and a less engaging discipline to most people than, say, civil rights or criminal law. The more serious problem is...

In one sentence § 2 of the Sherman Act condemns firms who “monopolize,” “attempt to monopolize” or “combine or conspire” to monopolize -- all without explanation. Section 2 is the antitrust law’s only provision that reaches entirely unilateral conduct, although it has often been...