2. Domestic fund managers change frequently. WIND statistics show that as of May this year, the average tenure of successive fund managers of stock-based open-end funds is only 14.59 months, which means that if you make a fixed investment in 15, you should be psychologically prepared to switch to 10 fund managers. However, because index funds are passive investments that follow the index, personal influence, that is, the fund manager, can be ignored. His style is persistent and faithful, and investors can hold it with peace of mind.