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Per Capita Income
Per capita income (PCI) or average income measures the average income earned
per person in a given area (city, region, country, etc.) in a specified year. It is calculated by dividing the area's total income by its total population.
As a measure of prosperity
Per capita income is national income/total population.
Per capita income is often used to measure an area's average income. This is used to see the wealth of the population with those of others. Per capita income is often used to measure a country's standard of living. It is usually expressed in terms of a commonly used international currency such as the euro or United States dollar, and is useful because it is widely known, is easily calculable from readily available gross domestic product (GDP) and population estimates, and produces a useful statistic for comparison of wealth between sovereign territories. This helps to ascertain a country's development status. It is one of the three measures for calculating the Human Development Index of a country.
In the United States, it is defined by the U.S. Census Bureau as the following: "Per capita income is the mean money income received in the past 12 months computed for every man, woman, and child in a geographic area." (Children are counted if they are at least 15 years old.)
Critics claim that per capita income has several weaknesses in measuring prosperity:
- Comparisons of per capita income over time need to consider inflation. Without adjusting for inflation, figures tend to overstate the effects of economic growth.
- International comparisons can be distorted by cost of living differences not reflected in exchange rates. Where the objective is to compare living standards between countries, adjusting for differences in purchasing power parity will more accurately reflect what people are actually able to buy with their money.
- It is a mean value and does not reflect income distribution. If a country's income distribution is skewed, a small wealthy class can increase per capita income substantially while the majority of the population has no change in income. In this respect, median income is more useful when measuring of prosperity than per capita income, as it is less influenced by outliers.
- Non-monetary activity, such as barter or services provided within the family, is usually not counted. The importance of these services varies widely among economies.
- Per capita income does not consider whether income is invested in factors likely to improve the area's development, such as health, education, or infrastructure.