To which extent high performances in professional sports are based on the use of illicit substances or other doping practices is extremely difficult to measure empirically. Game-theoretical approaches predict strong incentives to dope based on the interaction among athletes (prisoner's dilemma)...

In the framework Hotelling-Downs competition two players can freely choose a position along a one-dimensional market. We introduce restrictions of feasible strategies and analyze the consequences for players and consumers. In equilibrium players may minimally differentiate away from the center...

We characterize the outcome of majority voting for single--peaked preferences on median spaces. This large class of preferences covers a variety of multi--dimensional policy spaces including products of lines (e.g.\ grids), trees, and hypercubes. Our main result is the following: If a Condorcet...

We conducted a multi-wave field experiment to study the interaction of peer effects and self-control among undergraduate students. We use a behavioral measure of self-control based on whether students achieve study related goals they have set for themselves. We find that both self-control and...