Should the FTC have allowed Zillow to acquire its foremost rival, Trulia? It is increasingly well-accepted that digital platforms tend toward dominance in their immediately adjacent relevant-product markets. Google, for example, has long held a majority share of the markets for general-search...

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,...

This article adopts a holistic approach to China’s antitrust strategy towards the platform economy. As enforcers everywhere come to terms with the unique challenges posed by the market power amassed by digital gatekeepers, China’s sudden, fierce attack on its own tech giants has been as...

The emergence of the multi-sided platform business model has had a profound impact on the news publishing industry. By acting as gatekeepers to news traffic, large online platforms have become unavoidable trading partners for news businesses, and exert substantial bargaining power in their...

Should internet era merger policy differ from industrial era merger policy? Platform ecosystems rely on economies of scale, data-driven economies of scope, high-quality algorithmic systems, and strong network effects that frequently promote winner-take-most markets. Their market dominance has...

We revisit the economics of “platform envelopment strategies,” whereby a dominant platform (the enveloper) operating in a multi-sided market (the origin market) enters a second multi-sided market (the target market) by leveraging the data obtained from its shared user relationships. In...

This article provides an overview of the Australian Competition and Consumer Commission (ACCC) Digital Platforms Inquiry, as a case study in the new thinking about digital platform regulation taking place in many nations. With its focus upon the impact of digital platforms on news and...

Our submission to the U.K. House of Lords, Internal Market Sub-Committee is based on our joint research, which explores the effects Big Data and technology have on competition dynamics. It reviews the use of technology to facilitate collusion, conscious parallelism, and unilateral price...

Digital platforms have reshaped many product markets and play an increasingly important role in economies around the globe. Some of these platforms have become powerful players and may possess a lot of market power. Economists use a number of indicators to assess market power. In this article we...

In rapid succession, a number of jurisdictions have moved away from focusing on antitrust enforcement to the proposed regulation of digital platforms. Ostensibly, the regulatory focus is about competition and potential concerns that traditional ex post enforcement may be ill-equipped to address...