The Economist invented the Big Mac index in 1986 as a tongue-in-cheek guide to currency valuations. Because the well-known burger is the same throughout much of the world, the magazine thought it could be used as a measure of how over or undervalued a currency was. An overpriced burger suggests an overvalued currency and a cheap one an undervalued currency. As it did last year, Switzerland topped the chart this year...
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