This study examines reasons for the declining share of revenue going to Major League Baseball players. Though the players' union and team owners have proposed competing explanations, the phenomenon has not received any rigorous academic study. Economic theories for the similar decline of labor's...

During the early days of professional baseball, the dominant major leagues imposed a “reserve clause” designed to limit player wages by restricting competition for labor. Entry into the market by rival leagues challenged the incumbent monopsony cartel's ability to restrict compensation....