We show that professional soccer players exhibit reference-dependent behavior during matches. Controlling for the state of the match and for unobserved heterogeneity, we show on a minute-by-minute basis that a player breaches the rules of the game, measured by the referee's assignment of cards,...

Peer and cohort effects are important in health economics, and obesity may be related to social relationships, where obese individuals interact with other obese individuals. There were significant 19th century cohort effects, where BMIs were related to the cohort that an individual belonged....

The vast literature on the effects of immigration on wages and employment is plagued by likely endogeneity and aggregation biases. Ours is among the first papers to address both of these issues by means of causality analysis and by accounting for human capital endowments. Our analysis confirms...