The Big Mac index - BurgernomicsOur Big Mac index shows how burger prices differ across bordersUsing patty-power parity to think about exchange rates THE BIG MAC index was invented by The Economist in 1986 as a lighthearted guide to whether currencies are at their “correct” level. It is based on the theory of purchasing-power parity (PPP), the notion that in the long run exchange rates should move towards the rate that would equ
