巨无霸指数基于购买力平价理论，该理论认为汇率应该使不同国家的一揽子商品的价格相等。
THE Big Mac index is based on the theory of purchasing-power parity (PPP)—exchange rates should equalise the price of a basket of goods in different countries.
另一种定义货币的公平价格方式是购买力平价，其理念是：从长久来看，国家之间的汇率应该使价格相趋于相等化。
An alternative way of defining the "fair" value of a currency is purchasing-power parity (PPP) : the idea that, in the long run, exchange rates should equalise prices across countries.
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