If investors sell funds in a profitable state, some of them will not lose money if they sell funds at a low point. If investors sell funds at a loss, some of them may lose money, because investors have already lost money when they sell, and buying at a low point may not necessarily lead to the fund's rise, but may continue to fall.

The fund mainly earns the bid-ask price difference, and buys at a low price and sells at a high price to obtain income. Generally, investors of daily trading funds are not recommended, and the fund fluctuates little, so the probability of making money through short-term trading is small.