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。

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.

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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。

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.

youdao

该指数基于购买力评价理论确立，根据购买力平价理论长期汇率应当调整使两国同样的一篮子商品的价格相同。

It is based on the theory of purchasing-power parity (PPP), which argues that in the long run exchange rates should move to equalise the price of an identical basket of goods between two countries.

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