If I think the exchange rate of the dollar to something else is decreasing then I sell dollars and buy the something else.

Quote from miamicanes:
In all honesty, I wouldn't lose too much sleep about the Dollar vs other currencies, other than making half an effort to diversify like I did where it's convenient and easy.
The fact is, so many economies are so totally dependent upon the Dollar, it's almost not even worth BOTHERING to worry about, because if things truly get THAT BAD in America, the rest of the world will have LONG SINCE been reduced to rubble and poverty first.
* South/Central America, Mexico, and Canada? Screwed.
* Europe? Screwed by both circumstance AND self-mutilation.
* Asia? China's economy depends on America and Europe... and the other countries depend on America, Europe, and China.
* Africa? Always BEEN screwed, always WILL be, too, regardless of what happens.
* Mideast? Petrodollar isn't just a metaphor. One or two particularly bad terrorist attacks, and the economies of Dubai and/or Israel are toast.