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.

指数在购买力平价（PPP）这一概念基础上产生，购买力平价是指货币应以使商品价格在各个国家保持一致的汇率兑换。

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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.

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。

youdao

The Big Mac index is based on the theory of purchasing-power parity (PPP), according to which exchange rates should adjust to equalise the price of a basket of goods and services around the world.

巨无霸指数以购买力平价理论为基础。根据该理论，汇率需调整以均衡全球范围内的一篮子食物和服务的价格。

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Net Enrollment Ratio in primary education had increased from 58% in 1999 to 76% by 2010 and the Gender parity index from 0.85 to 0.93 over the same period of time.

UNESCO: EDUCATION

While male literacy rate is 71.6 percent, it is only 44.5 percent for women, revealing Gender Parity Index (GPI) at 0.62, with women still lagging behind men by more than 27 percentage points.

UNESCO: celebrates International Literacy Day in Nepal

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.

FORBES: Big Mac Index: Indian Rupee Most Undervalued Currency In The World