Per capita income

Per capita income is a calculation used by researchers and policymakers to understand the standard of living of a population in a specific location. This number is calculated by dividing the total personal incomes in an area by the total population to get the average income per person. Everyone in the region, including children, is included in the population count. This calculation is often used to compare the standard of living in two or more locations. As such, the calculation is often made in dollars, regardless of the local currency. While per capita income can provide a comparative understanding between two locations, the calculation only tells us about the amount of money earned by individuals. It does not account for the price of goods and services in the location or the value of goods that do not need to be purchased.

Overview

Per capita income calculations have become increasingly important as scholars attempt to compare the ways that people live in different countries and cities. By comparing per capita income between two cities, we can make comparisons about what goods and services residents can afford. We can also compare the ways that the economy has changed over time in a specific region, allowing us to understand whether the region is becoming more or less economically prosperous. However, it is important to note that per capita income calculations do not account for inflation. This means that when looking at historic per capita numbers, it is necessary to do an additional calculation for inflation to understand how the number relates to the present day.

In the United States, per capita income calculations allow for comparisons between cities and states. In this way, policymakers and researchers can identify places of poverty and weak economies and then develop programs to help those areas. Specific calculations are produced using data from the US Department of Commerce’s Bureau of Economic Analysis, which keeps track of wages, salaries, and other sources of income such as farms, building rentals, and small businesses.

Critics of per capita income calculations point out that these calculations often oversimplify a complex network of economic situations and statuses. For example, a per capita income calculation tells us little about the income of individuals. Locations with a large gap between the very rich and very poor may have a high per capita income number even though many citizens are living in poverty. This is because per capita income does not account for income distribution. Additionally, comparisons between different locations can be difficult because the price of goods and services can differ widely. This is why researchers often add a second calculation, purchasing power parity, to their calculations. Purchasing power parity calculates the comparative cost of goods—such as the comparative cost of a loaf of bread in two locations. Considering per capita income alongside purchasing power parity provides for even more detailed and accurate comparisons between different locations.

Bibliography

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Gordon, Robert J. The Rise and Fall of American Growth: The U.S. Standard of Living Since the Civil War. Princeton University Press, 2016.

Kenton, Will. “What Is Per Capita Income? Uses, Limitations, and Examples.” Investopedia, 24 June 2024, www.investopedia.com/terms/i/income-per-capita.asp. Accessed 1 Feb. 2025.

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Milanovic, Branko. "Global Income Inequality in Numbers: In History and Now." Global Policy, vol. 4, no. 2, 2013, pp. 198–208, doi:10.1111/1758-5899.12032. Accessed 1 Feb. 2025.

Sachs, Jeffrey D. "Institutions Don’t Rule: Direct Effects of Geography on Per Capita Income." National Bureau of Economic Research, Feb. 2003, www.nber.org/papers/w9490. Accessed 1 Feb. 2025.

Taylor, Mark P. Purchasing Power Parity and Real Exchange Rates. Routledge, 2013.