We study experimentally the effects of sorting in contests between groups of heterogeneous players whose within-group efforts are perfect substitutes. The theory predicts that higher aggregate effort will be reached when variation in ability between groups is lower, i.e., by a more balanced...

We prove the existence of monotone pure strategy Bayesian equilibria in two types of contests between groups under incomplete information: (i) individual-level private information group contests, where each player only knows her own ability, and (ii) group-level private information group...

Doping, or the use of illegal performance-enhancing drugs, is an epidemic problem in sports ranging from the Olympics to high school athletics. Sports organizations have been trying numerous approaches to discouraging these activities. This paper presents a theoretical model of doping in a...

We prove the existence of monotone pure strategy Bayesian equilibria in group contests under individual-level and group-level private information. For the latter type, we develop a novel approach reducing group contests to contests between individuals with multi-dimensional types, with...