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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Floating exchange rates destabilise trade and investment by wrenching relative prices away from their fundamental values (that is, from the values that would put the corresponding exchange rates at purchasing-power parity).

ECONOMIST: One world, one money

EU's figures are in purchasing-power-parity terms, which strip out the effects of exchange-rate fluctuations.

ECONOMIST: How rich is London?

China currently has only 3% of the total vote, not much more than Belgium (with 2.2%), even though China's economy is seven times larger at market exchange rates and a lot bigger still at purchasing-power parity.

ECONOMIST: Playing leapfrog