The red arrow is the active bid, which is subject to the seller's price, and the green arrow is the active bid, which is subject to the buyer's price.

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