We've been on an artificial economic model for so long people sincerely forget the relationship between value and cost. Currency exchange rates are based on several factors, mostly tangible marks like stock market, GDP, debt, etc. But primarily they're based on confidence. If you think about, the international economy is essentially a confidence game. I can reduce the sell price of your companies stock by leaking a story that you won't be able to deliver product as promised. It becomes viral, there is a panic, and the company is broke. Same is true for countries ... that's why investor confidence in the US has been dipping. China is a bigtime investor in us, and they've hedged their currency against our predictable demise. They consume US, and they've lost confidence. Meanwhile, our confidence in their ability to produce cheap products has not dipped.