CHART OF THE DAY: The iPod And Big Mac Indexes Just Don't Work: "...a side-by-side comparison of the Big Mac Index and the iPod Nano Index suggests that these might not really be good metrics for measuring currency valuations. As you can see, the two indexes result in wildly uncorrelated results. If it were really a matter of currency valuation, you’d expect both to show similar valuation problems. Instead, the pattern just seems random"
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