Fund income = (current net value-net value at the time of purchase) * fund share handling fee. For example, investors buy a fund with a net value of 1, buy 900 shares and sell the fund with a net value of 1.5 and sell 300 shares. If the handling fee is not calculated, the fund income = (1.5-65438.

The main purpose of fund investment is to earn the bid-ask difference. Only when the price of the fund rises can the fund gain income. If the investment target goes up, the fund goes up and the investment target goes down, then the fund goes down.