Economists often compare the wealth of countries in terms of purchasing power parity because

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Purchasing power parity (PPP) is a measure that controls for the different costs of living across countries, and enables economists to compare the wealth of countries by looking at how much it costs to purchase a set bundle of goods in each country. Using PPP allows economists to compare standards of living between countries more accurately since it accounts for differences in the cost of living. It is not primarily used to address issues such as different currencies or inflation rates, nor does it control for the national debt of countries.

Economists Often Compare the Wealth of Countries in Terms of Purchasing