Disparities

Disparities are measurable differences between social groups in outcomes, resources, treatment, or access, such as gaps in income, education, health, wealth, employment, or exposure to the criminal justice system, often linked to race, class, gender, age, disability, or place. The term is widely used in public health and policy, and it is sometimes distinguished from inequity, which implies that the difference is unfair and avoidable. Max Weber’s concept of life chances provides a foundation for understanding differences in group outcomes, and W. E. B. Du Bois documented racial disparities in The Philadelphia Negro. Bruce Link and Jo Phelan’s fundamental cause theory explains why disparities in health persist as new treatments emerge, and Michael Marmot’s research on the social gradient shows that outcomes worsen with each step down the hierarchy. Thomas Piketty has documented wealth and income disparities, while Melvin Oliver and Thomas Shapiro analyzed the racial wealth gap. Raj Chetty has mapped differences in mobility across neighborhoods, and Kimberle Crenshaw’s intersectionality highlights compounding disadvantage. Debates concern causes, measurement, and the balance between discrimination, structure, and choice. Disparities remain central to research on inequality, health, education, labor markets, and policy.