Published Quarterly Journal of Economics Online 8 Jan 2026 Published Apr 2026Changing Opportunity: Sociological Mechanisms Underlying Growing Class Gaps and Shrinking Race Gaps in Economic MobilityRaj Chetty · Will Dobbie · Benjamin Goldman · Sonya R Porter · Crystal S YangThis paper documents sharp divergent trends in intergenerational economic mobility by race and class in the United States across the 1978 to 1992 birth cohorts, and investigates the causal mechanisms …