As economists with significant experience in competition, telecommunications, and regulatory matters, we have filed the attached brief in the case of State of New York v. Deutsche Telecom supporting the plaintiffs, who have sued to prevent the merger of T-Mobile and Sprint. We explain why the...

How should market designers tradeoff competition and specificity? We study a natural experiment in the release of new advertising targeting technology. The platform in our study introduced targeting into select geographic markets using a regression discontinuity. We find that advertisers use new...

Following up on our initial comments at the Tunney Act proceeding of the proposed merger between Sprint and T-Mobile, we discuss DOJ's criticisms of these comments, explaining why these criticisms are baseless. Moreover, using evidence from the NY v. Deutsche Telecom trial, we provide new...

As economists with significant experience in competition and regulatory matters, we offer comments on the remedies proposed by the Department of Justice to address the competitive effects flowing from the proposed merger of Sprint and T-Mobile, as recognized by the DOJ's Complaint. We find that...

This paper proposes a novel regulatory framework for financial interconnectedness and introduces a new concept: “self-contained networks”. In networks where each bank is too costly for other banks to let fail, banks endogenously rescue each other. Such networks are self-contained since they...

In this article, I present causal effects of institutional entry barriers to new firms on incumbents' technological innovation. In particular, I investigate the effect of entry barriers to municipal providers on incumbents' technology deployment in the U.S. broadband industry. I use a spatial...

I measure how mergers in the market for broadband internet service affect short-run welfare. Mergers between internet service providers (ISPs) with non-overlapping markets may decrease welfare by increasing ISP bargaining leverage against content providers. However, study of this welfare channel...

There is a long debate whether TV advertising time should be restricted (as in the EU and UK nowadays) or be left unregulated (as in the US since 1982). This paper exploits a novel dataset of per hour data on 12 major TV broadcasters in France to investigate the efficiency of regulation using an...

We develop a model of dynamic platform formation under positive platform externalities. Users can switch between an incumbent and entrant platforms, switching opportunities arise stochastically and users can choose whether to accept or reject an opportunity to switch. For homogeneous users, we...