Financing financial products such as stocks are not the chief culprit of the economic and financial crisis, and a company needs to develop. Money is inseparable, and the best way to prepare money is to issue stocks and bonds. The original value of futures is to hedge risks. Therefore, it is not such financial products that cause the financial crisis, but human greed. People always like to borrow more money and don't want to pay back more. When the debt reaches a certain level, it is followed by a debt crisis. The debt is high, the economy is weak, and the bubble is born. Once the bubble begins to burst, financing will be tightened, followed by an economic downturn, which may lead to an economic crisis. In this process, finance acts as a lubricant for economic operation. Too much is not enough, too little is worse.