People have long debated whether state-run lotteries exploit the poor or are a win-win that generates enjoyment and government revenues. We study socially optimal lottery design in an optimal taxation framework with biased consumers and estimate sufficient statistics for optimal policy. Lottery...

People's fairness preferences are an important constraint for what constitutes an acceptable economic transaction, yet little is known about how these preferences are formed. In this paper, we provide clean evidence that contrast effects arising from previous transactions play an important role...

Recent large-scale randomized experiments find that helping people form implementation intentions by asking when and where they plan to act increases one-time actions, such as vaccinations, preventative screenings and voting. We investigate the effect of a simple scalable planning intervention...