Productivity Growth Is the Only Thing That Makes a Country Richer Over Time
Living standards rise when output per hour worked rises. Everything else is a one off, and productivity growth has slowed across developed economies for decades without a settled explanation.
Why It Is the Only Thing
Total output can grow three ways: more workers, more hours per worker, or more output per hour. The first two have hard limits, and neither raises output per person, which is what living standards actually depend on.
Productivity, output per hour worked, is the only source of sustained improvement. Compounded over decades it is the difference between a country where each generation lives substantially better than the last and one where they do not.
The Compounding Point
Small differences in productivity growth produce enormous differences over a working lifetime.
| Annual productivity growth | Living standards after 40 years |
|---|---|
| 1 percent | About 1.5 times |
| 2 percent | About 2.2 times |
| 3 percent | About 3.3 times |
The gap between one percent and two percent sounds trivial in any given year and is the difference between a modest improvement and a doubling within a career.
Almost every distributional argument is easier in a fast growing economy, because rising output means gains can go to some without coming directly from others.
Where It Comes From
Productivity improves through several channels: more capital per worker, better skills, and, most importantly, better ways of doing things.
The third channel, usually captured as total factor productivity, is the residual after accounting for capital and labour inputs. It covers technology, organisational improvement, and the reallocation of resources toward more productive firms. It is also the part that has slowed most.
The Slowdown
Measured productivity growth has declined across developed economies since roughly the early 1970s, with a partial revival around the late 1990s that did not persist. This has happened despite obvious technological advance, which is the puzzle.
The main explanations each have force and none is conclusive.
The measurement argument holds that we are undercounting output, particularly free digital services and quality improvements. This is certainly true to some degree and most researchers conclude it is too small to explain the gap.
The diffusion argument holds that technology exists but spreads slowly. The evidence here is reasonably strong: the gap between the most productive firms and the rest has widened, suggesting the frontier is advancing while the average firm fails to adopt.
The exhaustion argument holds that earlier innovations, electrification, sanitation, the internal combustion engine, were simply more transformative than recent ones, and that comparable gains are not available.
The composition argument notes that economies have shifted toward services, where productivity improvement is genuinely harder. A string quartet requires the same four musicians it always did.
Why It Resists Policy
Governments would very much like to raise productivity growth and have limited tools. Investment in education, research, and infrastructure plausibly helps and operates over decades. Competition policy and removing barriers to firm entry and exit help by reallocating resources toward better firms.
What does not work is anything fast. The productivity slowdown has persisted across many countries with very different policies, which suggests the causes are deeper than any national policy mix.
Why It Explains So Much Else
Slow productivity growth means slow real wage growth, which is the underlying source of a great deal of political discontent. It also means lower potential growth, which constrains what governments can promise, and it makes debt harder to grow out of.
Much of what gets discussed as separate problems, stagnant wages, fiscal strain, intergenerational tension, traces back to the same source.
The Bottom Line
Productivity growth is the only durable source of rising living standards, it has slowed across the developed world for half a century, and no explanation is fully convincing. The practical consequence is that a great many economic and political difficulties are downstream of one unresolved question about why we have stopped getting better at producing things as quickly as we used to.