Gould, Eric D. (contributor); Winter, Eyal (contributor) - 2007
negative effect if they are substitutes. The theory is tested using panel data on the performance of baseball players from 1970 … performance of his peers, but decreases with the quality of the team's pitching. Furthermore, a pitcher's performance increases … with the pitching quality of his teammates, but is unaffected by the batting output of the team. These results are …