The second question is simple. Of course, if someone wants to sell it, you have to buy it first.
As mentioned above, the futures index you buy must have a seller. You are gambling with the seller. (and vice versa) If you win a little, the seller loses a little. You won a hundred points and the seller lost a hundred points. And so on. , futures trading = zero-sum game
What is futures?
Futures index is somewhat different from stocks. Stocks can be bought as long as they are issued, and the circulation is limited, so the circulation is equal to the sum of the holdings. Futures refers to trading as long as it is bought and sold, and there is no circulation restriction, but the quantity depends on the open contract and net amount. In futures index trading, as long as there are n good positions, there must be n short positions, and both sides decide to win or lose by the bid-ask spread, that is, making money from a good position means losing money from the short position, while making money from the short position. But the real stock is not a zero-sum game, and the maturity date of futures refers to the settlement date, so it is necessary to close or renew the position, and the winning or losing of the month must be settled. As long as you don't sell the stock, you won't be forced to close your position, and dividends are no longer a "zero-sum theory" behavior, because dividends can't be won by any party at a loss.
Zero sum game?
Zero-sum game means that as long as someone scores positive, someone will score negative, and both sides' scores will be zero. This is the case in the futures market. There is no good situation, that is, as long as one party makes money, the other party loses money. ,