They're bluffing

China threatens to trigger US dollar crash

They most certainly can do it but they won't. A dollar crash, which seems what the world is working toward as Iran starting selling oil to the Japanese in Yen (the US dollar has been the only currency used to trade oil for a long time) and Chavez is rattling sabers. But it won't happen because China's economy is as dependent on us as we are on theirs. If they crush our economy, we don't buy goods from them, and there is no other market to sell their goods in the quantity they sell us. We fold, they fold, and so do a lot of other countries. They might yet go ahead if they are crazy enough to do it. Communism triumphs by beating the capitalists at their own game. As the people don't have much of a voice in China, I could see the leaders not caring if people can't buy cell phones and new cars. But I don't think that will happen. Other countries' citizens are much more willing to riot in the streets.