If you have more money, you can manipulate a stock to buy at a low price, and then buy a part in a large order, resulting in the illusion that the stock is in short supply. The stock price will naturally be high, and retail investors will follow suit. When it is raised, he will sell it. He made a profit, and the retail investors were trapped. Finally, retail investors cut meat and sell it. This is the winning mode of big fish. Also called high throwing and low sucking.