The gender wage gap: Extent, trends, and explanations

Summary

The research paper "The gender wage gap: Extent, trends, and explanations" by Francine D. Blau and Lawrence M. Kahn, published in 2017, provides a comprehensive analysis of the gender wage gap in the United States over three decades. The authors utilized microdata from the Panel Study of Income Dynamics (PSID) spanning the period from 1980 to 2010 to empirically investigate the extent and trends of the wage gap. Their methodology also involved a thorough survey of existing literature to identify and assess various explanations for the persistent gap. They specifically examined how gender wage disparities manifested across different points of the wage distribution, including the top, middle, and bottom, employing decomposition techniques to highlight the influence of measured factors on both the levels and changes observed in the gender pay gap. The study's findings reveal a significant narrowing of the gender wage gap between 1980 and 2010. However, this overall decline masks more nuanced trends, particularly at the higher end of the wage spectrum, where the gap diminished much more slowly and remained noticeably larger by 2010. A key finding was that by 2010, conventional human capital variables, such as education and experience, collectively accounted for a relatively small portion of the aggregate gender wage gap. In contrast, gender differences in occupation and industry continued to play a substantial role in explaining the disparities. The paper emphasizes that traditional explanations for the wage gap remain salient; for instance, women's workforce interruptions and shorter working hours continued to be significant factors, particularly in high-skilled occupations. Furthermore, the research indicates that differences in gender roles and the division of labor are important, and experimental evidence strongly suggests that discrimination cannot be overlooked as a contributing factor. Newer explanations, such as psychological attributes or noncognitive skills, were found to account for a small to moderate portion of the gender pay gap, though their impact was considerably less than that of occupation and industry effects. The strongest period of wage convergence occurred in the 1980s, with progress becoming slower and more uneven in subsequent decades, and a notable "unexplained" portion of the gap has remained stable since the 1980s. The implications suggest that policy efforts should continue to target anti-discrimination measures and support family leave, while also addressing the persistent occupational and industry segregation to foster further reduction in the gender wage gap.