Basics trading is a financial trading strategy which consists of the purchase of a particular financial instrument or commodity and the sale of its related derivative (for example the purchase of a particular bond and the sale of a related futures contract).
Buying shares is referred to as “going long”, while “long only” means investors who only buy stocks and do not short them. … At a future point in time, the short seller will cover the short position by buying it in the market and repaying the loaned stock to the broker.
Gains from trade are the net benefits to economic agents from being allowed an increase in voluntary trading with each other. In technical terms, they are the increase of consumer surplus plus producer surplus from lower tariffs or otherwise liberalizing trade.