Using 641 principles of economics students across four universities, the authors examine whether providing monetary incentives in a prisoner's dilemma game enhances student learning as measured by a set of common exam questions. Subjects either play a two-player prisoner's dilemma game for real money, play the same game with no money at stake…

Background: Cluster randomized experiments that assign intact groups such as schools or school districts to treatment conditions are increasingly common in educational research. Such experiments are inherently multilevel designs whose sensitivity (statistical power and precision of estimates) depends on the variance decomposition across levels.…

Background: Cluster-randomized experiments that assign intact groups such as schools or school districts to treatment conditions are increasingly common in educational research. Such experiments are inherently multilevel designs whose sensitivity (statistical power and precision of estimates) depends on the variance decomposition across levels.…