What drives most of the rise in between-firm earnings inequality?
Core argument: About 75% of the rise in between-firm earnings inequality is attributed to rising inequality across detailed 4-digit NAICS industries, driven primarily by inter-industry earnings differentials rather than shifts in employment distribution across industries.
Approximately 75% of the increase in between-firm inequality is attributed to rising inequality across detailed 4-digit NAICS [North American Industry Classification System] industries, primarily driven by inter-industry earnings differentials rather than shifts in employment distribution. Occupation effects account for nearly all of the rise in these differentials, with 66% due to changing occupation mix across industries and 27% due to existing occupation mix differentials. Managerial, professional, and technical roles have seen the sharpest rise in earnings differentials, while production and sales lag behind. The task-based framework highlights how technology and globalization impact firms differently, with a dominant effect at the industry level. This underscores the need for further research into the evolving role of occupations across industries.










Ed Comment:Silvia,Thank you for taking an interest in my book and offering me the opportunity to contribute. While I would love to write an op-ed for your publication, I just can’t devote enough time at this moment to do this topic justice. There is little doubt that companies have grown shrewder about outsourcing tasks. Firms have increasingly organized by skill level. I mentioned both of these trends in my book, and in a piece that has not yet been published (below). Perhaps the researchers referenced in the footnotes could/would write the op-ed. These dynamics have produced large shifts in the allocation of skill between companies. High-paid workers have increasingly clustered in companies largely composed of high-paid workers, like Microsoft and Goldman Sachs—companies with the knowhow to magnify the productivity of the most productive workers.Jae Song, David Price, Fatih Guvenen, Nocholas Bloom, Till von Wachter, "Firming Up Inequality."i]At the same time, companies like Apple and General Motors, have increasingly outsourced low-paid labor to companies with a preponderance of low-paid workers making it harder for lower-skilled workers to share collectively in the success of higher-skilled workers. Elizabeth Weber Handwerker, “Increased Concentration of Occupations, Outsourcing, and Growing Wage Inequality in the United States,” U.S. Bureau of Labor Statistics, April 2017, http://www.sole-jole.org/17733.pdf.ii]iJae Song, David Price, Fatih Guvenen, Nocholas Bloom, Till von Wachter, "Firming Up Inequality."iiElizabeth Weber Handwerker, “Increased Concentration of Occupations, Outsourcing, and Growing Wage Inequality in the United States,” U.S. Bureau of Labor Statistics, April 2017, http://www.sole-jole.org/17733.pdf.Lauren Weber, "Some of the World’s Largest Employers No Longer Sell Things, They Rent Workers,"Wall Street Journal, December 28, 2017, https://www.wsj.com/articles/some-of-the-worlds-largest-employers-no-longer-sell-things-they-rent-workers-1514479580