Yes... there are countries out there that have totally given up on their own currency and only use the US dollar. there are many many other countries that use it in addition to their currency. http://en.wikipedia.org/wiki/Dollarization
There are only a few currencies that are used like this. What makes you think that Iraq... with no economy except for Oil which is sold for dollars... what's going to make people around the world want to hold dinar?
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