2. Economic concept: from the definition of index, in a broad sense, the relative number formed by the comparison of any two values can be called index; The narrow index is a special relative number, which is used to measure the comprehensive changes of multiple projects in different occasions.
Statistics designed and calculated according to the prices of some sample stocks or bonds are used to measure the price fluctuation of the stock market or bond market. In the United States, for example, the common stock price indexes are Dow Jones Industrial Average and Staples 500 Enterprise Index. The most famous bond price indices are salomonbrothersbondindex and Sheeson-Lehman Bond Index. In China, there are circulation-weighted stock index, CITIC index and Xinhua index produced by Shanghai and Shenzhen stock exchanges.
Interpretation of English-Chinese Dictionary of Securities Investment by Commercial Press: index Index. In the field of securities investment, it refers to: stock price index; Stock index. An index compiled by statistical methods to reflect the overall price of the stock market or the changes and trends of a stock price, also known as stock price index or stock index. According to the coverage, it can be divided into a comprehensive index reflecting the whole market trend and a classified index reflecting the stock price of the industry. Index is not only a comprehensive index to measure the fluctuation range and prosperity of the whole market, but also an important basis for investors to make decisions.