The index is based on the idea of purchasing-power parity (PPP), which says currencies should trade at the rate that makes the price of goods the same in each country.

指数在购买力平价（PPP）这一概念基础上产生，购买力平价是指货币应以使商品价格在各个国家保持一致的汇率兑换。

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The theory of purchasing-power parity (PPP) implies that high-inflation currenciesshould depreciate, relative to harder monies.

根据购买力平价理论推导，高通胀货币应当对低通胀者贬值。

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It is based on the theory of purchasing-power parity (PPP), which says that exchange rates should equalise the price of a basket of goods in any two countries.

其基础是购买力平价理论，该理论认为，汇率应保持一篮子消费品在任何两个国家里价格相同。

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So, the figures in this calculation are given in Purchasing Power Parity (PPP) dollars.

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We do need to adjust for purchasing power parity (PPP) or the difference in what things cost.

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Properly done Purchasing Power Parity (PPP) adjustments are very complicated, but if we judge by 2011 IMF figures than roughly speaking we should boost the nominal value of Russian wages by about 28% to capture their actual purchasing power.

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