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Purchasing power parity: Difference between revisions
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[[Image:PPP2003.svg|thumb|400px|right|Purchasing Power Parity (PPP) of Gross Domestic Product for the countries of the world as of 2003. The economy of the United States is used as a reference, so that country is set at 100. Bermuda has the highest index value, 154, thus goods sold in Bermuda are 54% more expensive than in the United States.]] | [[Image:PPP2003.svg|thumb|400px|right|Purchasing Power Parity (PPP) of Gross Domestic Product for the countries of the world as of 2003. The economy of the United States is used as a reference, so that country is set at 100. Bermuda has the highest index value, 154, thus goods sold in Bermuda are 54% more expensive than in the United States.]] | ||
''' | '''Purchasing power parity''' ('''PPP''') is an alternative measure of the wealth of nations based on the long-term equilibrium [[exchange rate]] of two currencies to equalize their [[:en:purchasing power|purchasing power]]. Developed by [[:en:Gustav Cassel|Gustav Cassel]] in 1918,<ref>Gustav Cassel, "Abnormal Deviations in International Exchanges," in ''Economic Journal'', (December, 1918), 413-415</ref> it is based on the [[:en:law of one price|law of one price]]: the theory states that, in ideally efficient markets, identical goods should have only one price. | ||
This purchasing power SEM rate equalizes the purchasing power of different [[Currency|currencies]] in their home countries for a given basket of goods. Using a PPP basis is arguably more useful when comparing differences in living standards on the whole between nations because PPP takes into account the relative ''cost of living'' and the ''inflation'' rates of different countries, rather than just a nominal [[gross domestic product]] (GDP) comparison. The best-known and most-used purchasing power parity exchange rate is the [[Geary-Khamis dollar]] (the "international dollar"). | This purchasing power SEM rate equalizes the purchasing power of different [[Currency|currencies]] in their home countries for a given basket of goods. Using a PPP basis is arguably more useful when comparing differences in living standards on the whole between nations because PPP takes into account the relative ''cost of living'' and the ''inflation'' rates of different countries, rather than just a nominal [[gross domestic product]] (GDP) comparison. The best-known and most-used purchasing power parity exchange rate is the [[Geary-Khamis dollar]] (the "international dollar"). | ||
