Why Growth Is Getting Harder

For over a century, the trend line for the long-term growth of the U.S. economy has held remarkably steady. Notwithstanding huge changes over time in economic, social, and political conditions, growth in real gross domestic product (GDP) per capita has fluctuated fairly closely around an average annual rate of approximately 2 percent. Looking ahead, however, there are strong reasons for doubting that this historic norm can be maintained.
Consider the four constituent elements of economic growth tracked by conventional growth accounting: (1) growth in labor participation, or annual hours worked per capita; (2) growth in labor quality, or the skill level of the workforce; (3) growth in capital deepening, or the amount of physical capital invested per worker; and (4) growth in so-called total factor productivity, or output per unit of quality-adjusted labor and capital. Over the course of the 20th century, these various components fluctuated in their contributions to overall growth. The fluctuations, however, tended to offset each other, so that weakness in one element was compensated for by strength in another. In the 21st century, this pattern of offsetting fluctuations has come to a halt as all growth components have fallen off simultaneously.

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