If you listen to the world's "leading economists" when investing you'll become a beggar in days. What they say in public and what they do themselves is totally different and anyone with a brain knows that.
Trillions in FDI? China's total FDI is 100 billion. What are you talking about. The investment isn't in liquid assets either, the physical investments can't be moved off shore period.
"China's growth comes both from huge state investment in infrastructure and heavy industry and from private sector expansion in light industry instead of just exports, whose role in the economy appears to have been significantly overestimated.[18] The smaller but highly concentrated public sector, dominated by 159 large SOEs, provided key inputs from utilities, heavy industries, and energy resources that facilitated private sector growth and drove investment, the foundation of national growth. In 2008 thousands of private companies closed down and the government announced plans to expand the public sector to take up the slack caused by the global financial crisis.[19] In 2010, there were approximately 10 million small businesses in China.[20]"
Economy of the People's Republic of China - Wikipedia, the free encyclopedia
Exports are 1.5 trillion out of 6 trillion: 25% of the economy. On the other hand for Germany, it's 1.1 trillion out of 3 trillion: 33% of the economy.
Also, you may have forgotten a basic fact about communist governments: they have sweeping authority to regulate the economy. If the US were to collapse and depress DEMAND, the government can supply the DEMAND. but the US has a much more serious problem: it loses its SUPPLY and it is much harder to increase SUPPLY than for the government to simply buy things. With a much lower supply, prices would SKYROCKET in the US and cause riots, while in China, the excess (temporarily) supply would depress prices for manufactured goods which would increase the effective purchasing power of peasants, resulting in an even more stable society.
You have no clue what the difference between foreign reserves and FDI is. Please don't mislead others.