Heterogeneity, leveling the playing field, and affirmative action in contests

The heterogeneous abilities of players in various competitive contexts often lead to undesirable outcomes such as low effort provision, a lack of diversity, and inequality. A range of policies is implemented to mitigate such issues by enforcing competitive balance, that is, by leveling the playing field. Some of those policies, known as affirmative action (AA) policies, are practiced in ethical response to historical discrimination against particular social groups, and are also aimed at increasing competition. This survey summarizes the rapidly growing literature on contest theory regarding AA and other policies that level the playing field. Using a general theoretical structure, we outline the theoretical, experimental, and empirical research findings on contest outcomes under a multitude of policy mechanisms, and in doing so, we touch upon some of the common debates in the AA literature.