The changing composition of academic majors and wage dynamics: Beyond mean returns

Abstract

This paper studies the effects of the changing composition of academic majors during expansion of higher education on the dynamics of wage distribution. Using a unique dataset constructed from open-ended responses in the Russia Longitudinal Monitoring Survey, we conduct a structural analysis of wage distribution dynamics for higher education graduates over 2002–2016. In addition to the standard mean wage estimations across majors we explore within-major and across-cohort variation, as well as major-specific permanent and transitory variance components and their time paths.The results suggest that changing wage inequality among university graduates is due to both changes in skill prices and wage shocks induced by economic fluctuations. Moreover, variation in skill prices relates to equilibrium effects induced by changes in the supply of graduates specialized in different fields. Uneven expansion in certain majors induces labor market saturation and leads to an increase in the wage variance of graduates from the fastest growing majors. The estimation results also show the importance of accounting for within-major heterogeneity across cohorts, which could reflect differences in student ability distribution, changes in academic content, and changes in educational quality over time. Finally, this study suggests that focusing only on mean wage returns, without assessing the distributional implications, might substantially understate the labor market impact of the changing major composition.