In my opinion, the root of this financial crisis is the credit system of some developed countries. They abuse financial leverage to create market bubbles, make prices artificially high, and make huge profits from them. Once the bubble bursts (that is, people think that the price is too high, everyone is afraid and sells stocks or real estate in succession. ), this time triggered a crisis. Originated in America. Financial industry, service industry, trade industry, IT industry (the biggest customer of IT industry is financial industry), raw materials industry and energy industry. Harm: causing economic recession, austerity, rising unemployment rate and people's lack of confidence in the economy (this is the most terrible). Increase China's domestic demand, allow export enterprises to sell things that can't be sold at home to save China's trade, strengthen international cooperation, establish a new financial system, especially a credit and moral system, and rebuild people's confidence in the economy. The above is my opinion, for reference only.