Short selling, mainly in futures and foreign exchange markets. It means that if the trend is predicted to fall, first set up a short contract to sell, and then wait until the market price falls before buying a contract to close the position and make a profit. That is, everyone said' buy it' to make money. For example, in the market, gold 300 yuan/gram, we predict that it will fall to 290 yuan/gram, and we can establish an' agreement' or a short contract. First sell the primary gold at a price of 300 (there is no gold in hand at present). After the agreement comes into effect, I will pay the original money. When the price falls to 290, I will buy primary gold, deliver, close the position or cancel the contract. In fact, in this transaction, I still bought at the price of 290 and sold at the price of 300, but in a different order. Doing business with everyone is the same.

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