China has a current account surplus (they export more goods than they import). To keep their exchange rate down, they export the capital back out, funding thing

China has a current account surplus (they export more goods than they import). To keep their exchange rate down, they export the capital back out, funding things like rail in Africa. It's not the free market. Much of the surplus savings/capital in China is inside state controlled banks and conglomerates. Average Chinese citizens have a hard time taking capital outside the country, which is a driving force behind their overpriced real estate and the popularity of bitcoin there.