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Can you help me get my head around the USD chart? In my head it only makes sense to value one currency vs another (i.e. the USD to GBP exchange rate) so seeing one chart which simply plots "USD" over time is a bit tough to wrap my head around.

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that chart most likely comes from this calculation: http://en.wikipedia.org/wiki/U.S._Dollar_Index

Thanks. So a weighted index of USD vs a handful of other currencies - that's a useful measurement I never really knew existed.

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