By holding their currency to a strict peg against the U.S. dollar, the Chinese authorities have essentially required that their citizens hold at least some of their savings in U.S. dollars.
Without these savings from China and other nations, everyone in the United States including the government would have a much more difficult time borrowing, and they would likely have to pay much higher interest rates for the privilege. High interest rates and scarce credit would be a lethal combination for a debt-fueled economy.
As current American leaders come into increasing conflict with China, this lifeline needs to be clearly understood, before it is callously cast adrift. Of course, since this relationship cannot last forever,t he sooner it ends the less painful it will be, particularly for Americans. The longer you eat for free, the harder it is to feed yourself when the free food stops coming.
— Peter Schiff; How an Economy Grows and Why It Crashes