Use sufficient cash on hand to short-sell the stock market, futures, and bonds at high prices...Sell a large number of stocks and futures in the market, causing the public to follow suit, causing the stock market to fall severely, and then take advantage of the low prices Buy a large amount to earn the price difference. Or take advantage of the low price to buy a large amount of stocks that are far lower than their actual market value (the company itself has no problem, it is just a problem with the capital chain), and wait for the government to come to rescue the market. After the financial crisis has passed, the stock price If you raise it... you will make money!!!! In short, when there is a financial crisis, in the end it is the ordinary people who pay for the rich and the mistakes made by the big capitalists...