Fund jiacang refers to buying the original fund again or in batches. Fund positions will increase the fund share. Adding positions in the process of fund decline will reduce the fund cost. Adding positions during the fund's rise will increase the cost of the fund.

Selling and buying a fund is to buy a fund at one time. You don't necessarily buy the same fund, so your share won't increase. You can hold as many shares as you buy, and the fund cost will not change.