The United States is a consumer country, and China can earn foreign exchange by exporting low-priced goods. After the consumption in the United States is stimulated, the economy will accelerate its growth. The state will issue treasury bonds, and China will buy them with dollars in its hands, thus increasing the stable foreign exchange savings, reducing the possibility of economic crisis and partially controlling the economic trend in the United States. It's a cycle, so the United States now strongly urges China to appreciate the RMB, and when the commodity prices in China rise, the above impact will be much weakened.