Why Is The Labor Share Declining?
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Decline in labor share may be driven by software substituting for workers in cognitive-intensive occupations, particularly since 2000.
Sangmin Aum and Yongseok Shin, “Why Is The Labor Share Declining?” Federal Reserve Bank Of St. Louis Review, Fourth Quarter 2020, https://research.stlouisfed.org/publications/review/2020/10/22/why-is-the-labor-share-declining
Software seems to be the key driver“….For manufacturing industries, import competition, computer intensity, and software intensity show significance. However, when all variables are included in the regression…only software intensity remains significant. For services, software intensity is the only variable that shows significance (Table 2).Since the flattening of the labor share in services contributed the most to the sharp drop in the aggregate labor share after the late 1990s, this analysis suggests that software can be an important part of the explanation for the trends in the labor share….”
Core insight, “….Once IPP capital was recognized as investment, it had to be included in value added and in the income account has since been counted as capital income. From the definition of the labor share (4), with a larger denominator but the same numerator, the labor share decreases mechanically. Because investment in IPP capital has been growing in the United States, as shown in Figure 3A, the inclusion of IPP in value added results in the fall of the measured labor share over time. Figure 3B shows the labor share with and without IPP: the green line is the labor share with IPP treated as investment (the current accounting method), and the orange line is the labor share with IPP treated as expenses (the pre-1999 accounting method). Since the labor share without IPP is more or less flat at least until the 2000s, the divergence between the two lines is evidence that IPP is an important factor in the decline of the labor share….”
The theory is starting around 2000 software started substituting for workers in cognitive intensive occupations. So software innovation have and will further reduce the labor income share. Their core evidence is Figure 6. “…From the occupational contributions to the labor share, shown in Figure 6, we see thatthe trend break in the aggregate labor share around 2000 can be entirely attributed to the stagnation of cognitive-intensive occupations, although routine-intensive occupations have been responsible for the gentle, longer-run downward trend….”
Good note published by FRBSL presenting evidence that the fall in labor’s share has been driven by the rise in software investment, which had a larger impact on the service sector (versus manufacturing) and on high skill cognitive occupations, “…the literature emphasizes the gentle decline since the 1980s and has been silent about the more stark fall since 2000. Taking a detailed look at sectors, occupations, and types of capital, we provide evidence that service industries and cognitive occupations merit more attention in order to fully understand the trends in the labor share. In particular, separating software investment from other types of capital promises to be a fruitful avenue for research…”



Ed Comment:“…Good summary and explanation of important papers in this field from each of the relevant perspective. This dovetails with my argument that IT has opened a window of cognitive opportunities that exceeds the supply of talent, talent works to increase the productivity of talent, mainly by writing software. Revenue per cognitive employee increases (and labor’s share goes down). The question is, why hasn’t competition among firms with more productive employees driven down revenues proportionally. The answer I give in the chapter is that you have to be willing suffer a high risk of failure to get equity. The paper also cites a paper I have cited before that says 60% of the decline in labors share is caused by equity grants (and self-owned business income) not counted as labor income. Surely most of that is concentrated in the very cognitive segments showing a decline in labor’s share. …”