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PPP means purchasing power parity. PPP is the best way to use GDP per capita to measure wealth in a country because it is based upon what you can get(goods/ services) for the money you have. http://www.investopedia.com/updates/...er-parity-ppp/
Obviously some of these numbers are estimates.Purchasing Power Parity (PPP) is an economic theory that compares different countries' currencies through a market "basket of goods" approach. According to this concept, two currencies are in equilibrium or at par when a market basket of goods (taking into account the exchange rate) is priced the same in both countries.
Source:
https://www.imf.org/external/pubs/ft...=0&a=#download
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