Because the funds of fund companies have reached 3 trillion, the CSRC will impose many restrictions on fund companies, which will definitely limit the amount of funds invested in stock index futures, that is to say, fund companies can only use very little money to make futures indexes, which is insignificant for the huge fund scale. The reason is not mentioned here, it is very simple. Shui Pi specifically explained this problem yesterday. In other words, don't expect fund companies to make great profits by shorting.
The essence of futures is to sign long-term contracts with others to buy and sell goods (or stock indexes, foreign exchange, interest rates) in order to achieve the purpose of maintaining value or making money.
If you think the futures price will go up, go long (buy and open positions), go up (sell) and close positions, and earn: price difference = close positions-open positions.
If you think the futures price will fall, short (sell the position), fall (buy) and close the position, and earn: price difference = opening price-closing price.