And why shouldn't it be? The Big Mac consists of two 1.6 oz (45.4 g) 100 per cent beef patties, American cheese, "special sauce" (a variant of Thousand Island dressing),iceberg lettuce, pickles, and onions, served in a three-part sesame seed bun.
“Burgernomics is based on the theory of purchasing-power parity, the notion that a dollar should buy the same amount in all countries. Thus in the long run, the exchange rate between two currencies should move towards the rate that equalises the prices of an identical basket of goods and services in each country. Our “basket” is a McDonald's Big Mac, which is produced in about 120 countries. The Big Mac PPP is the exchange rate that would mean hamburgers cost the same in America as abroad. Comparing actual exchange rates with PPPs indicates whether a currency is under- or overvalued."