We explore how umpires' racial/ethnic preferences are expressed in their evaluation of Major League Baseball pitchers. Controlling for umpire, pitcher, batter and catcher fixed effects and many other factors, strikes are more likely to be called if the umpire and pitcher match race/ethnicity....

"In the Grutter case, Justice O'Connor suggested that universities could justifiably try to enroll a "critical mass" of minority students. Enroll fewer than that "critical mass," reason some observers, and minority students will feel too marginalized to perform at their highest levels. In this...