Per capita income is often used as a measure of the wealth of the population of a nation, particularly in comparison to other Particularly when comparing countries with substantially different levels of wealth, however, it has several weaknesses as a measurement. Economic activity that does not result in monetary income, such as services provided within the family, or for barter, are usually not counted. The importance of these services will vary widely between different economies, both between countries and among different groups within a country. Per capita income gives no indication of the ...