in my opinion, the root cause of this financial crisis is the credit system problems in some developed countries. They abused financial leverage to create a bubble in the market to make prices artificially high, and made huge profits from it. Once the bubble burst (that is, people felt that the price was too high, everyone was afraid, and they were selling stocks or real estate, etc.), it caused a crisis at this time. 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 internal demand, let export enterprises turn what they can't sell into domestic sales to save China's trade, strengthen international cooperation, establish a new financial system, especially the credit and moral system, and rebuild people's confidence in the economy. The above is my opinion, for reference only.