It should be a low position to open a position and a high position to reduce the position. Opening a position at a low level means that when the price of a fund or stock reaches its actual value, you can buy a part first, and then gradually buy it when it is determined that the fund or stock is rising, which can reduce the risk of the fund or stock. For example, if you open a fund or stock with 1W, the fund or stock with 5000 shares 1 yuan will rise to 1.5 yuan, and if you buy 2500 shares, you will buy 1500 shares ... so the cost risk of your fund or stock is also decreasing. This is how the inverted pyramid works, and it is also the favorite way for investors and bankers.