A tying arrangement is a seller’s requirement that a customer may purchase its “tying” product only by taking its “tied” product. In a variable proportion tie the purchaser can vary the amount of the tied product. For example, a customer might purchase a single printer, but either a...

A price squeeze occurs when a vertically integrated firm "squeezes' a rival's margins between a high wholesale price for an essential input sold to the rival, and a low output price to consumers for whom the two firms compete. Price squeezes have been a recognized but controversial antitrust...

There is widespread support for antitrust reform, fueled mainly by concerns about major platforms like Google, Facebook, and Amazon. Many believe that these companies have become too large and that they use their power in harmful ways. In the United States, some of the most aggressive reforms...

For competing firms, a patent settlement provides a rare opportunity to write an agreement that forestalls competition without transparently violating the antitrust laws. Problematically, such agreements are highly profitable for reasons that have nothing to do with resolving a patent dispute....

Platforms like Uber, Google Search, and Hulu pervade the modern economic landscape. A platform caters to distinct but deeply-interdependent “sides” of customers that derive value or revenues from one another, such as the merchants and cardholders on a credit card network, or the advertisers...

As technology and interconnectivity have continued to flourish, so too has an important and complex form of enterprise: the platform. Services like Uber, Google Search, Hulu, and American Express cater to distinct but deeply-interdependent “sides” of customers that derive value or revenues...

Large platforms are often accused of refusing to serve (or discriminating against) competing sellers in adjacent product markets. Antitrust law labels such activity a unilateral “refusal to deal” (RTD) and evaluates it under a predation-like framework shaped by the two leading RTD cases,...

The antitrust duty to deal is perhaps the most confounding and controversial form of antitrust intervention. It is sought by plaintiffs in situations where a monopolist controls a critical input (or “essential facility”) and unilaterally refuses to sell access to rivals. Courts have...

Should there be limits on startup acquisitions by dominant firms? Efficiency requires that startups sell their technology to the right incumbents, that they develop the right technology, and that they invest the right amount in R&D. In a model of differentiated oligopoly, we show distortions...