Big Mac Index
The Economist's 1986 joke that became a serious economic benchmark.
Where It Came From
The Economist ran the first Big Mac Index in 1986 as a throwaway — a 'lighthearted' guide to purchasing power parity. The idea: a Big Mac is the same product everywhere. Same beef, same bun, same process. If one costs $5 in New York and the equivalent of $2 in Beijing, that gap tells you something about exchange rates that official figures won't. What started as a joke has been cited in FX research, academic papers, and central bank briefings for four decades.
Why It Still Works
The index has flagged currency overvaluation in Argentina, Russia, and Turkey before the crises landed. It works because it's hard to fake — McDonald's prices are set by local cost structures, not by governments trying to look good. One standardized product, consistent ingredients, no revision methodology.
What a Gap Between This and CPI Means
When Big Mac prices rise faster than official CPI, purchasing power is eroding faster than the government admits. When the index diverges sharply from unemployment or GDP, something in the official narrative is off. The burger doesn't care about seasonal adjustments.
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