Between Firm Changes in Earnings Inequality: The Dominant Role of Industry Effects
- Date Posted:
- Is Database:
- Database
75% of rising btw-firm inequality is from rising inequality at industry level, primarily driven by inter-industry earnings differentials.
New Haltiwanger finds structural changes at industry level help explain rising earnings inequality:
“….We provide evidence thatmost (about 75%) of the rising between firm inequality is from rising inequality across detailed 4-digit NAICS industries. Most of this rise in inequality across industries is due to rising inter-industry earnings differentials and not due to changing distribution of employment across industries. We also find that the rising inter-industry earnings differentials are almost completely accounted for by occupation effects. For the raw rise in rising inter-industry earnings differentials, we find that about 92% of the increase is accounted for by occupation effects. About 66% of this is due to changing occupation mix across industries and 27% due to changing occupation mix differentials given the existing differences in the occupation mix across industries…. Consistent with their findings, we find that the occupations with the sharpest rise in earnings differentials that differ by industry are managerial, professional and technical with occupations like production and sales being left far behind.Our contribution is to integrate the changing role of occupations with the rise in between firm and in turn between industry inequality. Our findings show that the changing demand for tasks as evidenced in the changing occupational mix and occupational differentials is closely linked to between firm and between industry inequality....Specifically, we find that the rise in between firm inequality is dominated by a rise in between industry inequality. We find the latter is dominated by rising inter-industry earnings differentials with a more modest role for the changing distribution of employment across industries. In turn, we find that virtually all of the rising inter-industry earnings differentials is accounted for by occupation effects. This includes both changing mix of occupations within and across industries and rising occupation differentials. We find, after controlling for the mix of workers in terms of age, gender, and education (as well as other controls), that the occupations with especially sharp increases in earnings differentials that differ across industries are managerial, business and financial, sciences, legal, and healthcare, with occupations like protective services, sales, and construction being left behind. The increase in the management occupation differential across industries is especially striking…. Put differently, this task based framework helps motivate why changes in inequality associated with the changing role of occupations is linked to the changing role of firms in inequality. Driving forces such as technology and globalization that induce changing demand for occupations impact firms differentially. In principle, this differential impact could be between firms or between industries. Our findings suggest there is a dominant role for the between industry impact. An important direction for future research is to explore the changing role of occupations across industries...."

John Haltiwanger and James Spletzer, "Between Firm Changes in Earnings Inequality: The Dominant Role of Industry Effects," Institute of Labor Economics, February 2020, https://www.iza.org/publications/dp/12990/between-firm-changes-in-earnings-inequality-the-dominant-role-of-industry-effects










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