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...

The SSNIP test and Critical Loss Analysis are widely used tools for determining market definition in merger and sometimes other antitrust matters. However, the standard techniques used to test for a relevant antitrust market are incorrect when the firms in question operate two-sided platforms....

A multi-sided platform (MSP) serves as an intermediary for two or more groups of customers who are linked by indirect network effects. Recent research has found that MSPs are significant in many industries and that some standard economic results - such as the Lerner Index - do not apply to them,...

In 2005, Federated Department Stores, which does business as Macy's and Bloomingdales, acquired May Company Department Stores for $17 billion. Federal antitrust regulators took no action against this merger and in fact released an unprecedented statement explaining the decision to permit the...

We investigate patterns in common ownership networks between firms that are active in the US pharmaceutical industry for the period 2004-2014. Our main findings are that “brand firms” — i.e. firms that have R&D capabilities and launch new drugs — exhibit relatively dense common ownership...

Roughly a year into control of the federal antitrust agencies, President Biden’s antitrust team is turning its attention to policies and enforcement practices. They seem poised to start, as antitrust so often does, with market definition. This is an appropriate target for review but also...

Google distributes proprietary applications for its open-source Android mobile operating system (OS) free of charge. Some of those applications (apps) are offered together as a suite of apps known as Google Mobile Services (GMS). Manufacturers of mobile devices can agree, pursuant to Google's...

This chapter sets out the principles and emerging practice governing cartel damages in the EU and UK. It identifies the types of damages available; the issue surrounding causation, pass-on, volume effects, and mitigation; and the methods that have been be used to estimate overcharges, volume...

It is a core principle of antitrust law and theory that reduced market concentration lowers the risk of anticompetitive behavior. We demonstrate that this principle is fundamentally incomplete.Traditional models assume that firms interact only as competitors. We examine and model...