In 2020, the Department of Justice (DOJ) filed an antitrust suit against Google alleging that Google has unlawfully monopolized the markets for general search services, search advertising, and general search text advertising. The complaint raises questions involving market definition, monopoly...

Within the last three years, Google has acquired YouTube and DoubleClick and has attempted to control part of Yahoo!'s search advertising business. Two of the deals have not raised antitrust concerns by competition authorities. I review these deals with a focus on consumer welfare. Consumers are...

For well over a century, U.S. trademark law has afforded brand owners certain rights, remedies and obligations. As the Department of Commerce has noted, owners of trademarks have both a legal right and an affirmative obligation to protect their trademarks from unauthorized third-party use....

We analyze a large-scale randomized field experiment in which a search engine varied the prominence of search ads for 3.3 million US users: one group of users saw the status quo, while the other saw a lower level of advertising (with prominence of search ads decreased). Revealed preference data...

Proper analysis of the Google books settlement requires framing the issues correctly in two important respects. First, it requires understanding that sound antitrust analysis turns on likely effects on consumer welfare, not on debatable spins of arid formalisms. Second, it requires measuring...

Google Search and its algorithm have been subject to intense antitrust scrutiny from competition authorities both in the United States and around the world. Google's introduction of Universal Search in 2007 integrated specialized search results within a narrow category (for example, shopping or...

We analyze a search engine market from a law and economics perspective and incorporate the choice of quality improving innovations by a search engine platform in a two-sided model of internet search engine. In the proposed framework we, first, discuss the legal issues the search engine market...

In an online experiment, we measure users’ interactions with search engines, both in standard configurations and in modified versions with clearer labels identifying search engine advertisements. In particular, for a random subset of users, we change “Sponsored links” or “Ads” labels...