Index funds track index changes to the maximum extent according to contracts, reflecting index changes. This is the essence of index funds. People will only buy index funds if they are optimistic about the general trend. If an index fund manager does not track the index allocation and makes adjustments without authorization, even if the index falls and the index fund does not, he is not a qualified index fund manager. He should be an active securities investment fund.

Index funds, as the name implies, are fund products with specific indexes (such as Shanghai and Shenzhen 300 Index, S&P 500 Index, Nasdaq 100 Index, Nikkei 225 Index, etc.) as the target. ) as the underlying index, and take the constituent stocks of the index as the investment object, build a portfolio by buying all or part of the constituent stocks of the index, and track the performance of the underlying index. Generally speaking, the index fund aims to reduce the tracking error, make the change trend of the portfolio consistent with the underlying index, and thus obtain roughly the same rate of return as the underlying index.