There is 10 ton of water in the pond, and many parties increase 1 ton, and the empty party decreases 1 ton, or 10 ton of water, and many parties hold 1 ton, and the empty party holds 1 ton. If all positions are not closed, it will still be 10 tons of water.

If the institution and the big customer each take 5 tons of water, they have to ask at the current price. If many parties 1 yuan buy 3 yuan at the current price, the answer will be calculated by 3 yuan, which is very cost-effective. Empty side 1 yuan to buy, now quit will lose 2 yuan.

Finally, make up the deposit, pay the tax and you can take the business away. If you lose, you lose, and if you earn, you earn. Anyway, it's mutual money. Futures companies earn operating fees, and the rest has nothing to do with them. All they have to do is keep pulling customers to their company to open accounts and earn handling fees.