4000点！你知道沪指到底啥意思吗？

Group 1 - The article discusses the significance of the Shanghai Composite Index (沪指) as a reflection of the stock market in Shanghai [7][31] - It explains the concept of stock indices using an analogy of a fish tank, where the tank represents the stock market and the fish represent various stocks [10][12] - The article outlines how the index is calculated by comparing the current market value of stocks to an initial value, referred to as the base value [16][20] Group 2 - The Shanghai Composite Index includes all listed stocks on the Shanghai Stock Exchange, excluding ST and *ST stocks, and serves as a comprehensive indicator of market performance [31] - The index was established with a base date of December 19, 1990, when the index was set at 100 points [33] - The article notes that the index has reached a new high in the past 10 years, indicating significant market performance [35]