Investors can sell when the fund rises to realize part of the income, and at the same time sell when the fund rises, and the income from selling will be evenly distributed to the remaining positions, reducing the cost of holding positions, thus dispersing risks.

For example, when the net value of the fund is 1 yuan, Xiao Li bought a fund 1 000. Now the net value of the fund has risen to 1.5 yuan, and the fund account shows a profit of 500 yuan. Xiao Li intends to sell 500 copies when the net fund value is 1.5 yuan, so Xiao Li's cost will also change accordingly. Regardless of the formalities, Xiao Li's post cost =