From Population Growth to Firm Demographics: Implications for Concentration, Entrepreneurship and the Labor Share
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US labor force growth, driven by birth rates 16 years prior, is linked to increased concentration, slower new firm entry, and declining labor share.
great new NEBR paper finds that the interplay btw population and firm demographics explains the increase in concentration, decline in firm entry rates and the decline in the labor share
"...The US economy has undergone a number of puzzling changes in recent decades. Large firms now account for a greater share of economic activity, new firms are being created at a slower rate, and workers are getting paid a smaller share of GDP.... Three long-term changes in the US economy have attracted a great deal of attention. First, economic activity is being concentrated in fewer firms. For example, the fraction of workers employed by large firms increased by 6 percentage points since 1978. Second, the entrepreneurship rate — the ratio of new firms to total firms — has nearly halved since the 1970s. Third, the share of GDP going to labor, once thought to be stable, has declined since 1975....This paper shows thatchanges in population growth provide a unified quantitative explanation for these long-term changes. The mechanism goes through firm entry rates. A decrease in population growth lowers firm entry rates, shifting the firm-age distribution towards older firms. Heterogeneity across firm age groups combined with an aging firm distribution replicates the observed trends. Micro data show that an aging firm distribution fully explains i) the concentration of employment in large firms, ii) and trends in average firm size and exit rates, key determinants of the firm entry rate. An aging firm distribution also explains the decline in labor’s share of GDP. In our model, older firms have lower labor shares because of lower overhead labor to employment ratios. Consistent with our mechanism, we find that the ratio of nonproduction workers to total employment has declined in the US....We close by discussing the sources of labor force growth. We decompose labor force growth into three components: birth rates sixteen years prior, the growth in participation rate, and a residual term that captures rates of migration, death and institutionalization. We find that birth rates sixteen years prior account for the bulk of changes in labor force growth. We conclude that the rise and fall of labor force growth is primarily due to the baby boom..."
Hugo Hopenhayn, Julian Neira and Rish Singhania, "From Population Growth to Firm Demographics: Implications for Concentration, Entrepreneurship and the Labor Share," National Bureau of Economic Research, December 2018, https://www.nber.org/papers/w25382




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