Asher Schechter over at Pro-Market:
Of the various ills that currently plague the American economy, one that has economists particularly worried is the decline in the labor share—that is, the part of national income that’s allocated to wages.
The two standard explanations for why labor’s share of output has fallen by 10 percent over the past 30 years are globalization (American workers are losing out to their counterparts in places like China and India) and automation (American workers are losing out to robots). Last year, however, a highly-cited Stigler Center paper by Simcha Barkai offered another explanation: an increase in markups. The capital share of GDP, which includes what companies spend on equipment like robots, is also declining, he found. What has gone up, significantly, is the profit share, with profits rising more than sixfold: from 2.2 percent of GDP in 1984 to 15.7 percent in 2014. This, Barkai argued, is the result of higher markups, with the trend being more pronounced in industries that experienced large increases in concentration.
A new paper by Jan De Loecker (of KU Leuven and Princeton University) and Jan Eeckhout (of the Barcelona Graduate School of Economics UPF and University College London) echoes these results, arguing that the decline of both the labor and capital shares, as well as the decline in low-skilled wages and other economic trends, have been aided by a significant increase in markups and market power.
More here. Critiques of the paper can be found here and here.