The stock purchase index can be purchased through index funds and stock index futures. Each index fund has a corresponding index, which is generally a component index (the number of stocks is fixed), such as Shanghai and Shenzhen 300, Shanghai 50, 180, etc. There are also some index funds that choose graded indexes, such as dividend index and growth index. ?

Buying an index fund is equivalent to buying a basket of stocks contained in the corresponding index. If the index goes up, it will make money, and if it goes down, it will lose money. ? There is an ETF fund in index funds, which can be purchased and redeemed like ordinary funds, and can also be traded in the day like stocks.

Extended data

Calculation method of stock index

1, the stock index is the average stock price. However, as far as their actual impact on the stock market is concerned, the average share price is an overall level reflecting the changes of various stock prices, which is usually expressed as an arithmetic average. By comparing the average stock prices in different periods, people can know the changes of various stock prices.

2. The stock index is a relative index reflecting the changes of stock prices in different periods, that is, the percentage of the average stock price in the first period as the benchmark of the average stock price in another period.

3. Through the stock index, we can know the percentage of the stock price rising or falling in the calculation period relative to the stock price in the base period. The stock index is a relative index, so for a long time, the stock index can measure the change of stock price more accurately than the average stock price.

Baidu Encyclopedia-Stock Index