Long position means that investors are optimistic about the stock market and expect the stock price to be bullish, so they buy the stock at a low price and sell it when the stock rises to a certain price to obtain the difference income. Short selling is an investment term for stocks and futures: for example, when you expect a stock to fall in the future, sell the stock you own when the current price is high, and then buy it when the stock price falls to a certain extent, so the difference is your profit. Position refers to the amount of funds owned or borrowed by investors. Position is a kind of market agreement, which promises to buy and sell the initial position of foreign exchange contracts, and those who buy foreign exchange contracts are long and in the expected position; Selling foreign exchange contracts is an empty position and is in the expected position.