"Naked short selling" refers to an investment method in which investors directly sell nonexistent stocks in the market without borrowing stocks, and then buy back the stocks for profit when the stock price falls further. As long as naked short sellers buy stocks before the delivery date, the transaction is successful. Because "naked short selling" sells non-existent stocks, the amount may be very large, so it will have a dramatic impact on the stock price. Some analysts believe that Lehman Brothers is one of the victims of naked short selling.