It is more appropriate for the fund to buy on the day of the plunge. The fund T+ 1 trades and buys on the trading day. According to the net value at the close of the buying day, the share is confirmed on the second trading day. When the fund plummets, the cost for investors to buy is relatively low. The lower the cost, the less risk investors take and the greater the probability of earning in the future.

The decrease of fund price will lead to the decrease of buying cost, because the same price can get more chips, the risk will be relatively reduced, and the possibility of obtaining income is greater.