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Since we went off the gold standard, there's nothing to back up the dollar anymore other than confidence that the US currency is consistent with production of real goods and productivity in general, and that the US <b>pays off its debts</b>. As our deficit approaches the $10 trillion mark, such a promise looks increasingly laughable. The dollar's been *the* currency since the destruction of the British Empire after WWII sank the pound, and because of this the dollar has been the de facto reserve currency used for international transactions the world over. But if the US debt keeps accumulating-- and this before the retirement of the baby boomers-- the central banks elsewhere in the world will see US dollar-backed investments (the T-bills) as lousy bets, with a US debt repayment increasingly implausible. They'll then move their own currency reserves elsewhere, to e.g. euros, yuan (Chinese renminbi) and yen. To make matters worse, we're stuck with interest payments so high that a big portion of our GDP has to go to paying them these days.
The movement away from the dollar is already taking place, and it's one reason that interest rates keep rising (which is on the verge of killing the housing market-- the one factor keeping the US economy afloat). When China removed the dollar peg, it moved to a basket of currencies and, although the exact composition is a secret, the Euro in particular has become a big gainer. Japan and Korea, too, are gradually diversifying into Euros for their reserves-- "gradually" being the key word since too quick a movement out of dollars would cause their current reserves to plummet, so they have to ease out. China's also using its dollar hoard to buy a massive oil reserve from Saudi Arabia, and the Saudis in turn are themselves exchanging the dollar for Euros, parking an increasing fraction of their assets in Europe. So the dollar's becoming a hot potato that fewer people really want or trust. Even black marketeers and drug dealers are increasingly desiring Euros for cash payments, a humorous but very telling indication of where people's confidence lies these days.
The only remaining pillar that's halting a wholesale collapse of the dollar is its essential value in oil trades, something that's been the case since Nixon and Kissinger negotiated a treaty with Saudi Arabia in the 1970's, but even the petrodollar hegemony is falling apart. Iran is already selling its oil in Euros to Europeans and its Chinese and Indian customers, while Venezuela sells some of its oil in Euros or uses barter for the same. Russia still sells mostly in dollars but is also easing into Euro-based sales at least for its European customers, and both Indonesia and Malaysia, interestingly enough, have been making the strongest moves toward Euro-based oil sales.
It's interesting that the dollar's troubles in the past 40 years have both been provoked by American military disasters. The movement of the dollar away from the gold standard was caused in large part by the defeat in Vietnam, indeed this may have been Vietnam's most important consequence. Now, a similar result is unfolding due to the Iraq disaster. Iran will soon be setting up its own oil bourse in March of 2006. While the ministers in charge of the bourse have tried to dampen speculation about which currency will be used, it's not difficult to see that at least some of the denomination will be done in Euros-- in part b/c Iran sells so much of its oil to European customers, in part because Iran sees sales in Euros as a check to the financing of the US military machine that has put Tehran directly in its crosshairs. The Iranians are no fools, and they know that the dollar-- above any other factor-- underlies the USA's increasingly shaky world standing.
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