The Big Mac index was invented by The Economist in 1986 as a lighthearted guide to whether currencies are at their “correct” level.

The Big Mac index - 2015

Burgernomics was never intended as a precise gauge of currency misalignment, merely a tool to make exchange-rate theory more digestible.

This adjusted index addresses the criticism that you would expect average burger prices to be cheaper in poor countries than in rich ones because labour costs are lower.

Shape of things to come

The Big Mac index

The Big Mac index 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 equalise the prices of an identical basket of goods and services (in this case, a burger) in any two countries. — The Economist

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