Stock index futures have the following practical functions:
Avoid price risk. Managing the risk of stock portfolio means preventing systemic risk (what we usually call market risk). Usually, we use hedging to manage the risk of our stock investment, and investors can avoid the risk by operating reversely in the stock market and stock index futures market.
Price discovery. Arbitrage with stock index futures. The so-called arbitrage is to use the pricing deviation of stock index futures to buy the index components of stock index futures and sell them at the same time, or to short the index components of stock index futures and buy stock index futures at the same time, so as to obtain risk-free returns.
Improve the efficiency of fund allocation. Stock index futures are widely used by institutional investors to improve the efficiency of fund allocation because of its margin trading system and low transaction cost. For example, if the margin rate is 10%, and you buy 1 CSI 300 index futures at the price of 100000, then as long as the futures price rises 1%, compared with the margin of100000 yuan, you can earn100000 yuan.