"Iran poses a far more serious threat to the U.S. than its disputed nuclear aspirations. Over the last few years, Iran has unleashed a weapon of mass destruction of a very different kind, one that directly challenges a key underpinning of American hegemony: the U.S. dollar as the exclusive global currency for all oil transactions.
How the Petrodollar System Works
In a nutshell, any country that wants to purchase oil from an oil producing country has to do so in U.S. dollars. This is a long standing agreement within all oil exporting nations, aka OPEC, the Organization of Petroleum Exporting Countries. The UK for example, cannot simply buy oil from Saudi Arabia by exchanging British pounds. Instead, the UK must exchange its pounds for U.S. dollars. The major exception at present is, of course, Iran.
This means that every country in the world that imports oil—which is the vast majority of the world's nations—has to have immense quantities of dollars in reserve. These dollars of course are not hidden under the proverbial national mattress. They are invested. And because they are U.S. dollars, they are invested in U.S. Treasury bills and other interest bearing securities that can be easily converted to purchase dollar-priced commodities like oil. This is what has allowed the U.S. to run up trillions of dollars of debt: the rest of the world simply buys up that debt in the form of U.S. interest bearing securities. ''
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