Social media are at the center of countless debates on polarization, misinformation, and even the state of democracy in various parts of the world. An essential feature of social media is their recommendation algorithm that determines the ranking of content presented to the users. This paper...

Selecting the relevant covariates in high-dimensional panel data remains a central challenge in applied econometrics. Conventional fixed effects and random effects models are not designed for systematic variable selection under model uncertainty. In addition, many existing models such as LASSO...

This paper examines the theoretical and empirical consequences of rank-based reward systems in schools in which students' performance and effort are evaluated relative to their peers. In such environments, classmates act simultaneously as competitors - due to rank-determined rewards - and as...