The so-called "buy more" is bullish buying, and the "more" here is bullish.

The so-called "short selling" means selling short, and the "empty" here means selling a paper contract instead of a physical object.

Options include buy more (call option), short (call option), sell more (put option) and short (put option). Among them, buy call option and sell put option are multi-party (call option), and buy put option is empty (put option).

Futures can be bought first and then sold, or they can be sold first and then bought for hedging. Therefore, futures should create a new concept and distinguish between the first trading behavior and the trading direction. The trading direction creates the concepts of buy more and short selling, and the trading behavior creates the concepts of opening and closing positions.

Buying more refers to buying futures contracts (multiple positions), and short selling refers to selling futures contracts (short positions). Buying more in the same month and buying short positions are just two sides of the same contract, not two kinds of contracts.

Extended data:

Trading classification of stock index futures.

Agricultural products futures: such as soybean, soybean oil, soybean meal, indica rice, wheat, corn, cotton, sugar, coffee, pork breast, rapeseed oil and palm oil.

Metal futures: such as copper, aluminum, tin, lead, zinc, nickel, gold, silver, rebar, wire, etc.

Energy futures: such as crude oil (plastics, PTA, PVC), gasoline (methanol) and fuel oil. Emerging varieties include temperature, carbon dioxide emission quota and natural rubber.

Stock index futures: such as FTSE index in Britain, DAX index in Germany, Nikkei average index in Tokyo, Hang Seng index in Hong Kong, Shanghai and Shenzhen 300 index, etc.

Baidu encyclopedia-futures

Xinhuanet-Extreme climate threatens agricultural futures to climb.