Why should they pander to the currency traders? That's like hitching your wagon to the emotional responses of lemmings. Great if you start the selling trend so you can wait and pick up that currency for fire sale prices and then just wait until it goes up again. It's part of the reason for economic instability in the world. The US dollar being both the reserve currency and the petro dollar doesn't experience the volatility that other currencies do. That volatility costs individuals and businesses big time. I don't blame China for refusing to play that game.