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posted on 15 November 2015

Slow Capital Accumulation And The Decline In Labor's Share Of Output

from the Cleveland Fed

Since capital and labor tend to be complementary in the production of goods and services, the same factors that have slowed down capital accumulation since the early 2000s may have weakened businesses' labor demand and may have decreased the labor share.

The labor share of output - the ratio of labor compensation to output - has trended downward for decades, but it has declined at a faster rate since the early 2000s. The labor share in the nonfarm business sector hovered around 64 percent in the 1950s, declined to 61.4 percent in 2002, and dropped more rapidly thereafter. It is currently close to 57 percent.

Figure 1. Labor Share

A declining labor share means that wages grow less than productivity. Since the early 2000s, wages have risen much more slowly than productivity. Since 2002, real compensation per hour in the nonfarm business sector has grown at an average annualized rate of 0.74 percent, while productivity has grown at an average annualized rate of 1.79 percent.

Figure 2. Real Wage and Productivity

The causes of the long-term decline of the labor share are debated but likely include changes in the technology used to produce goods and services, increased globalization and trade openness, and developments in labor market institutions and policies.

According to Karabarbounis and Neiman (2013), the decrease in the relative price of investment goods, partly due to progress in information and communication technologies, has induced firms to replace labor with capital, thereby reducing the labor share. Elsby, Hobijn and Sahin (2013) find that part of the long-term decline in the labor share may be explained by the offshoring of labor-intensive production processes, which has led to a higher capital-labor ratio in U.S. production, and a lower labor share.

Lawrence (2015a and 2015b), however, points out that the labor share decline may be connected with a lower, rather than a higher, capital-labor ratio. Most estimates suggest that capital and labor tend to be complementary in the production of goods and services, which means that production requires the use of both capital and labor together, and it is difficult to substitute capital for labor or labor for capital. When capital and labor are complementary, a decrease in the capital-labor ratio is associated with a contraction in businesses' demand for labor, which leads to a plunge in the wage rate and to a decline in the labor share. Lawrence then connects the labor share decline with a lower effective capital-labor ratio induced by labor-augmenting technological progress - a type of technological progress that raises the productivity of labor relative to capital and encourages businesses to substitute labor for capital.

Lawrence's argument suggests that the steeper decline of the labor share since the early 2000s may be connected with the slowdown of capital growth in those years. Capital services, which grew at an average rate of 4.3 percent annually before 2002, have since grown only 2.2 percent annually on average. Capital services per hour, an indicator of the capital-labor ratio, grew at an average rate of 2.89 percent annually before 2002, but have since grown 2.05 percent annually on average.

Figure 3. Capital Services

Depending on the strength of the complementarity between capital and labor, a given decrease in the growth rate of the capital-labor ratio can be associated with a sizeable decline in the labor share. For instance, if we use an empirically plausible value for the strength of complementarity (an elasticity of substitution equal to 0.5), then a decrease in the capital-labor ratio of, say, 10 percent translates into a decrease in the labor share of approximately 2.5 percentage points, all else constant.

This suggests that the same factors that have slowed down capital accumulation since the early 2000s may have also weakened businesses' labor demand, leading to a faster decline in the labor share and a wider gap between wage growth and productivity growth. One such factor could be the deceleration of multifactor productivity. Since 2005, multifactor productivity has grown 0.58 percent annually on average, more than a percentage point slower than in the previous 1996-2004 period, which was characterized by fast productivity growth.

Figure 4. Multifactor Productivity


Source publications/ economic-trends/2015-economic-trends/et-20151110-slow-capital-accumulation-and-the-decline-in-labors-share-of-output.aspx


The views expressed in Federal Reserve Bank of Cleveland publications and working papers are strictly those of the authors. They do not necessarily represent the position of the Federal Reserve Bank of Cleveland, or the Federal Reserve System. Any conclusions that you draw from the information available on or through this website, regardless of whether you received any assistan

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