The Big Mac Index by James Fransham, Lloyd Parker, Robert Jones and Phil Kenny

The Big Mac Index was invented by The Economist in 1986 as a lighthearted guide to whether currencies are at their "correct" level, based on the idea of purchasing-power parity. Since then, “burgernomics” has become a global standard, included in economic textbooks and the subject of many academic studies. In 2013 we modernised the Big Mac Index by making it an interactive infographic and online tool, now used by curious readers, foreign travellers, business people, and professional economists alike.