McCurrencies.

The article focuses on the 20th anniversary of the Big Mac Index, which compares the cost of a McDonald's Big Mac, which is produced in around 120 countries, in various currencies. The Economist's Big Mac index is based on one of the oldest concepts in international economics: the theory of purchasing-power parity (PPP), which argues that in the long run, exchange rates should move towards levels that would equalise the prices of an identical basket of goods and services in any two countries.