The Shanghai Composite Index cannot be bought and sold like ordinary stocks.

The stock price index is a statistical relative number of stock prices compiled to measure and reflect the overall price level and change trend of the stock market. Usually, the average stock price or stock market value in the reporting period is compared with the average stock price or stock market value in the selected base period, and the ratio between the two is multiplied by the index value in the base period, which is the stock price index for the reporting period.

When the stock price index rises, it indicates that the average price level of stocks has increased; when the stock price index falls, it indicates that the average price level of stocks decreases; it is a sensitive reflection of the society and politics of the country (or region) where the market is located. , a barometer of economic changes.

The Shanghai Securities Composite Index is referred to as "Shanghai Index" or "Shanghai Composite Index". Its sample stocks are all listed stocks on the Shanghai Stock Exchange, including A shares and B shares, reflecting the listing of the Shanghai Stock Exchange. changes in stock prices.

Extended information:

The Shanghai Stock Exchange Index was compiled by the Shanghai Stock Exchange and was publicly released on July 15, 1991. The Shanghai Stock Exchange Index is based on "points" and the base day is December 19, 1990. The base day withdrawal is set at 100 points. ?

With the continuous development of the Shanghai stock market, on February 21, 1992, the SSE A-share index and the SSE B-share index were added to reflect the respective trends of different stocks (A shares, B shares) . On June 1, 1993, SSE sub-indices were added, namely industrial index, commercial index, real estate index, public utility index and comprehensive industry index to reflect the respective trends of stocks in different industries. ?

So far, the Shanghai Composite Index has developed into a series of stock price indexes including the comprehensive stock price index, A-share index, B-share index, and category index. ?

Calculation formula:

The Shanghai Composite Index is a weighted comprehensive stock price index calculated by the Paschal formula with the number of shares issued during the reporting period as the weight. ?

Reporting period index = (total market value of sampled stocks during the reporting period/total market value of sampled stocks on the base day) × 100?

Total market value = ∑ (market price × issuance Number of shares)?

Among them, the total market value of the sampled stocks on the base day is also called the divisor.

Baidu Encyclopedia-Shanghai Composite Index