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What is PPP - Purchasing power parity (PPP) is a component of some economic theories and is a technique used to determine the relative value of different currencies.

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* “The Big Mac Index: Applications of Purchasing Power Parity”. Published by Palgrave Macmillan, 2003.

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from NPR.org

The World's Richest Countries And Biggest Economies, In 2 Graphics

A better measure for looking at the wealth or poverty of a nation's citizens is GDP per capita (adjusted for the fact that $1 buys more in some countries than in others). Here are all the countries in the world with GDP per capita over $15,000 a year:

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