Chinese Foreign Exchange Reserves
"In a world of systemic instability, reserves mean power. Reserves mean you can defend your currency, stabilise your banking system and boost your economy without resorting to yet more borrowing – or, worse still, the printing press.
More than half of China's reserves are denominated in dollars. So when the dollar falls, China loses serious money. When you're talking about a dollar-reserve number involving 12 zeros, even a modest weakening of the greenback sees China's wealth takes a mighty hit." source