Have you ever noticed the price of your favourite burger change over time? There's a whole economic theory that explains why! The Big Mac index is a survey created by The Economist magazine in 1986 to measure purchasing power parity (PPP) between nations, using the price of a McDonald's Big Mac as the benchmark. Purchasing power parity is an economic theory which states that exchange rates over time should move in the direction of equality across national borders in the price charged for an identical basket of goods. In this case, the basket of goods is a Big Mac.
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