because once China sold its USD, the selling would have probably done. Therfore USD would rebound.
I do not believe China will sell its USD though, simply because the damage to its foreign currency reserve would be huge if they did, larger than otherwise.
I think USD's falling is coming to the end very soon. Euro cannot stand single-handedly taking the hit any longer. Euro is so over-valued in terms of purchasing power that its interest rate gotta go down as appreciation of euro takes its toll on euro zone economy.
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