This article investigates whether peer effects manifest in the performance of National Collegiate Athletic Association (NCAA) 4 × 400 m men's relay teams. We test whether increasing the average quality of team members has a nonlinear and ultimately deleterious impact on team performance,...

National Basketball Association home teams produce more defense and more wins the more consecutive games they play at home, suggesting home games serve as on-the-job training for future games during the same homestand. Home teams produce less defense and fewer wins the more days off during a...