The central parityprice closed at one U. S. dollar for 7.8141 yuan, the lowest of the year.
重要的汇率价停留在1美元对7.8141人民币，这是全年最低的汇兑比率。
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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.
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.