GDP Per Capita and Standards of Living

Dividing GDP by population gives a better sense of average prosperity than total GDP alone - though it still leaves out how evenly that prosperity is shared.

A country with a huge total GDP but a huge population might actually offer a lower average standard of living than a much smaller country with a much smaller total GDP. Comparing raw GDP figures across countries of very different sizes, without adjusting for population, is exactly the kind of comparison this closing lesson warns against.

Dividing the pie by the number of people

GDP per capita is total GDP divided by a country’s population, giving a rough measure of average economic output per person. It’s a far more meaningful way to compare prosperity across countries of different sizes than total GDP alone, since total GDP mostly just reflects how large and populous a country is, not how prosperous each individual within it tends to be.

Why total GDP alone can be misleading

Imagine comparing a very large country with a huge population to a much smaller country with a fraction of the population, where the large country's total GDP is several times bigger. On raw GDP alone, the large country looks like the far more prosperous economy. But once you divide by population to get GDP per capita, the smaller country might actually turn out to have a notably higher average output per person, suggesting its residents are, on average, considerably more prosperous, even though its total economy is much smaller in absolute size.

Adjusting for different price levels across countries

Comparing GDP per capita across countries gets more complicated because the same amount of money doesn’t buy the same amount of goods and services everywhere - prices for many goods and services, especially things like housing and everyday services, tend to be considerably lower in some countries than others. Purchasing power parity, often abbreviated PPP, is an adjustment that accounts for these differences in local price levels, aiming to compare what people can actually buy with their income rather than just comparing raw currency figures at market exchange rates. GDP per capita figures adjusted for purchasing power parity tend to give a more accurate comparison of actual living standards across countries than unadjusted figures.

What GDP per capita still doesn’t capture

Assuming GDP per capita reflects how prosperity is shared, not just its average

GDP per capita is an average, and averages can hide enormous variation. A country with high GDP per capita but very unequal income distribution could have a large share of its population living in genuine poverty, even while the average figure looks strong - because a relatively small number of very high earners pull the average upward. This is exactly the same statistical trap covered in the opening lesson of this module's discussion of what GDP measures and misses: GDP per capita improves on total GDP by adjusting for population, but it still says nothing directly about inequality, and it inherits every other limitation of GDP itself, including its exclusion of non-market activity and environmental costs.

Closing out this module

GDP per capita, adjusted for purchasing power where meaningful comparisons across countries are needed, is one of the most commonly used shorthand measures of a standard of living - though, as this whole module has emphasized, from GDP’s own limitations through inflation, unemployment, and the business cycle, no single number ever tells the complete story of an economy’s health or a population’s genuine well-being. Reading macroeconomic statistics well means holding several of these measures in mind together, understanding what each one captures and what it leaves out.

Key takeaways

GDP per capita divides total GDP by population, giving a better sense of average prosperity than total GDP alone.
Purchasing power parity adjusts comparisons across countries for differences in local price levels.
GDP per capita is an average and can mask significant income inequality within a country.
GDP per capita inherits GDP's other limitations, including excluding non-market activity and environmental costs.
No single macroeconomic statistic fully captures an economy's health or a population's overall well-being.