Buy futures bulls (bullish) and bears (bearish). Options include buy long (buy call options), short (sell call options), sell long (buy put options) and short (sell put options), among which buy call options and sell put options are multi-party (bullish); Selling call options and buying put options are empty (bearish)

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.

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