Short selling, also known as short selling, short selling (Hong Kong) and short selling (Singapore, Malaysia), is an investment term of stocks and futures, and it is also an operation mode of the stock and futures markets. In contrast to bulls, in theory, it is to borrow goods to sell first and then buy them back. This model can profit in the wave band of falling prices, that is, borrowing goods at a high level and selling them, and then buying and returning them after falling.

Shorting crude oil means selling it when the current price of crude oil futures market is high, then buying it when the oil price falls to a certain level and returning it to the seller at the current price. The difference is the profit.