it's the trade deficit that threatens the US (and other) economies. Overproduction by one country that refuses to fairly trade with another. China's weath increases should be trickling down to the masses increasing their ability to buy goods that they couldn't afford, either from China's vast supply chain, or other countries. Instead the chinese are buying american treasury notes to keep the money hidden, and keep us paying them forever creating invisible debt, as well as keeping a lid on the changes in society that come with a well fed, and powerful middle class.