One possible scenario.
Iran attempts to open an oil trading bourse denominated in Euros at the end of March. In an attempt to knock the US off its hegemonic perch, China dumps its treasury bonds, flooding the market and causing the price to plummet. Other Asian and ME nations dump their dollars, the dollar falls to perhaps 20% of its current international purchasing power, effectively pricing oil to the US at $325 a barrel or thereabouts. This oil price crushes the abiilty of joe sixpack to drive to work in the megalopolises of Southern California and NYC area. Maybe even DC and San Francisco.
Fortunately for the rest of the world, this puts a significant portion of the 12 million barrels we currently import back on the market, and the price in euros actually goes down.
This would require the cooperation of China and Iran. I doubt Russia would object much.
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