This paper studies a model of search engine competition with endogenous obfuscation. Platforms may differ in the quality of their search algorithms. I study the impact of this heterogeneity in consumer surplus, seller profits and platform revenue. I show that the dominant platform will typically...

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...

New ways to use brands in social media are pressuring traditional conceptions of trademark law. Contrary to much trademark doctrine, every brand is built by a community, not by its proprietor alone. I previously described this phenomenon as consumer investment in trademarks. Internet technology...

In its Proposal for a Digital Services Act (“DSA”), the European Commission highlighted the need for new transparency obligations to arrive at accountable digital services, ensure a fair environment for economic operators and empower consumers. However, the proposed new rules seem to focus...