There is a certain reason for the fund to buy down. The decline of fund price will lead to the reduction of purchase cost. At the same price, you can get more chips, the risk will be relatively reduced, and the possibility of gaining income will be greater. However, the risks and costs to be borne by the fund will increase, and the probability of future losses will also increase.

Funds mainly earn bid-ask spreads, buy at a low price and sell at a high price to make profits, but it is best for funds to buy at a low level when they fall. If investors lose money when buying a fund during the decline, they can reduce the cost by adding positions, and the fund is more likely to recover capital or gain income later.