and pitcher match race/ethnicity. This effect only exists where there is little scrutiny of umpires' behavior -- in … determine the outcome of the at-bat. If a pitcher shares the home-plate umpire's race/ethnicity, he gives up fewer runs per game …

favoritism nor discrimination by gender, findings that are robust to a wide variety of potential concerns. We observe … heterogeneity in both discrimination and favoritism by nationality and by gender in the distributions of graders' preferences. We …