In 1894, W. E. B. Dubois completed coursework for a doctorate in economics at the University of Berlin, and in 1921, Sadie Alexander was the first Black American to earn a doctorate in economics at the University of Pennsylvania. Notwithstanding these rare early accomplishments by Black Americans in economics, there seems to be a more than one century “color line” in the hiring of Black economists in the United States academic labor market. The persistence of Black economist underrepresentation in economics faculties in the United States suggests that a color line constraining the hiring of Black economics faculty endures. In general, and in particular among economics doctorate–granting institutions in the United States, when sorting them by the number of Black Americans on the economics faculty, the median economics department has no Black economics faculty. Findings from the extant literature on the hiring and representation of Black economists suggest that the underrepresentation of Black PhD economists in economics faculties is consistent with, and conforms to, a history of racially discriminatory employment exclusion. This color line could be constraining the production of economics knowledge that can inform public policies that would reduce racial inequality and improve the material living standards of Black Americans in the United States. Future research on the underrepresentation of Black PhD economists in economics faculties in the United States could potentially benefit from accounting for unobservables that may matter for the supply and demand of Black PhD economists. This includes, but is not limited to, what is not observed about individual PhD economist mentoring experiences and parental occupational backgrounds.