>> Why you think so?
While China may have pegged it's exchange rate to the U.S. , it has the power to decouple at any time to adjust to changing market conditions.
Greece (and soon Portugal, Spain, & Italy) don't have that ability. What can they do? - beg for a bailout or exit the EURO and devalue their currency.
I guess there is a third option - dramatically cut SPENDING and entitlements.
What odds would you offer on common monetary policy in the EU falling apart first vs common monetary policy in the US and China falling apart first? (China and other countries are copying US policy, by pegging the exchange rate. They should fail soon, too, by the same logic.)