Published articles, working papers, policy writing, and older working papers.
European 4G auction evidence links low-band auction outcomes to later concentration and prices when incumbent operators entered auctions with higher pre-auction shares.
Online dating affected U.S. marriage markets differently across desktop and mobile eras: desktop usage raised divorce rates, while mobile activity lowered marriage and divorce rates.
Studies how the NCAA name, image, and likeness policy expanded influencer advertising opportunities and changed sponsored social media activity.
Pricing algorithms produced by contractors and LLMs are mostly supervised-learning routines; economics prompts improve contractor algorithms but can raise LLM prices through demand-estimation mistakes.
A GMM estimator identifies demand complementarity with price endogeneity and large choice sets, changing merger counterfactuals in chips and soda.
UCL School of Management long read arguing that AI tools such as ChatGPT are more likely to support complex problem solving than eliminate human critical thinking.
CEPR VoxEU column on the scale of undisclosed influencer advertising and why disclosure rules can miss hidden sponsorship.
Using more than 100 million Twitter posts, the paper estimates that 96% of sponsored influencer posts are undisclosed; a lower-bound classification still implies 82%.
German Instagram disclosure rules increased disclosure but also increased sponsored content by 12%, raised exposure to undisclosed sponsorship, and reduced engagement.
The Antitrust Source article on how pricing algorithms may act as third-party facilitators of collusion, drawing on recent U.S. cases and economic evidence on algorithmic pricing.
Consumer complementarity in DIY home improvement purchases grows with category experience, creating measurable value from moving along the learning path.
CEPR VoxEU column on how Twitter's October 2020 sharing friction affected news diffusion and political asymmetries.
Twitter's October 2020 sharing friction reduced news sharing, with larger reductions for left-wing outlets than right-wing outlets.
Using Android app store data and a store redesign, the paper shows that entry creates congestion externalities and erodes about 40% of consumer variety welfare gains.
Algorithmic pricing adoption increases margins in Germany's retail gasoline market, but only for non-monopoly stations; in duopolies, margins rise only when both stations adopt.
CPI Antitrust Chronicle article summarizing empirical evidence on AI-driven algorithmic pricing adoption in German retail gasoline markets and its implications for competition.
The surprise emergence of superstar mobile games increases entry in some niches, lowers entrant quality, intensifies price competition, and induces incumbents to raise quality.
Review of economic research on autonomous algorithmic collusion and the policy questions facing competition authorities.
A spatial demand model of Ontario wine retail evaluates how retail entry, product-range deregulation, and price competition affect consumption and welfare.
Evidence from Canada on how market incentives and competitive conditions relate to business innovation.