The Big Mac Index is based on the theory of purchasing-power parity (PPP), which says that exchange rates should move to make the price of a basket of goods the same in each country.

巨无霸指数是建立在购买力平价理论的基础上。 购买力平价理论认为，汇率应该使得一揽子商品的价格在各个国家都相同。

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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 each country.

它是基于购买力平价理论，也就是说汇率应该使不同国家的一篮子商品的价格达到均衡。

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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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The Chinese economy is set to become as large as that of the US by around 2016 when assessed in purchasing power parity terms, which factor in price differences between countries, it added.

CNN: OECD: China forecast to overtake U.S. by 2016

The Big Mac Index uses Purchasing Power Parity (PPP) in comparing the price of the ubiquitous Big Mac across countries relative to its price in the USA. PPP refers to the idea that exchange rates across two countries should be equal to the relative price of a basket of goods and services in both countries.

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