The main purpose of using short-term sharp drops to wash the market is to scare out investors who bought stocks at low levels, so that they can sell their stocks to newly entered ordinary investors at relatively high levels, thereby increasing the holding cost of ordinary investors. However, the chips bought by the main force at a low level were not sold, and in real trading, there were indeed a large number of investors who sold stocks during the short-term sharp decline of the overall market and individual stocks. Many investors also bought stocks after rebounding at a relatively low level, but this "relatively low level" was still higher than the average holding cost of the main force. These investors objectively helped the main force lock in chips in the process of raising stock prices in the future.

Figure 16 shows the trading of 000065 Northern International from February 25, 2009 to March 2, 2009, using a short-term sharp decline to clear the market. Please take a look at the time-sharing chart for yourself,

Figure 17 shows several short-term market crashes and washouts of 000939 Kaidi Electric Power from November 2008 to December 2008,,