Because China and Japan are both big exporters, and the United States is the main buyer, we sell things to the United States and get dollars; These dollars need to be invested to preserve and increase value; The United States is the largest country in the world, and the national debt is the safest, with fixed interest every year, so buying American national debt has become the main channel. And buying stocks is too risky! And buying U.S. Treasury bonds is equivalent to lending money to the United States. When the United States has money, it will continue to buy products made in China. When ordinary people can start working again, they will have wages to spend, so it is good for us.

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Please indicate the source of the old uncle's works in cornfield!