Short selling is a kind of commercial speculation. The objects of speculation are mostly stocks, bonds, foreign currencies and commodities. , or buy when the expected price rises before selling (short selling), or buy when the expected price falls before selling (short selling). You don't need to pay for the goods when you buy them, but you have to deliver them and collect money when you sell them. All you have to do is settle the surplus or loss according to the difference between one in and one out.
The so-called short selling means selling futures contracts and shorting. As long as there is enough money to open a position, you can short at any time during trading hours.
For example, soybeans are currently bearish at 3 100/ ton, so you can open positions at 3 100/ ton. At this point, the investor's position is sold. When the soybean fell to 3000/ ton, you bought and closed the position, thus earning 100 yuan/ton. Buying and selling is a mutual process. Futures, if you buy, you must sell, and if you buy, you must sell. Futures trade commodity contracts, not specific commodities. So you can sell the futures contract first, and then buy it, so it's balanced. If the investor doesn't have the goods on hand before delivery, then when the investor sells the futures contract, he must buy the goods to realize delivery.