Mainly depends on profitability.
For example, the net value of fund A is 1.0 and the net value of fund B is 2.0.
The same investment 10000 yuan, regardless of the handling fee.
Buy one copy, 10000 copies.
Buy b, 5000 copies
The net value of Fund A rose by 3% to 1.3.
The net value of Fund B rose by 3% to 2.6.
profit
The profit of buying A =1.3 *10000-10000 = 3000.
Profit from buying B = 2.6*5000- 10000=3000.
In fact, the profit is the same.
So what matters is not net assets, but profitability.
Where does it come from?