Small leek does not refer to leek, but refers to small retail investors who share stocks. Stock trading refers to buying and selling stocks upside down. The core content of stock trading is to obtain profits through the price difference between buying and selling stocks in the securities market. The rise and fall of stock prices change with the fluctuation of the market. The fluctuation of stock price often shows the characteristics of differentiation, which stems from the concern of funds, and the relationship between them is like the relationship between water and ships.

Price priority and time priority are implemented in stock trading: during the continuous bidding period, because many investors may buy and sell the same stock at the same time, the exchange has formulated the principle of "price priority and time priority". If the current price of a stock is 5.66 yuan, if investor A enters the purchase price of 5.66 yuan and investor B enters the purchase price of 5.67 yuan at the same time, investor B's declaration takes precedence over investor A's declaration ... If the purchase prices declared by everyone are the same, the transaction will be made first. The same is true for selling stocks. If the current price of a stock is 5.66 yuan, A enters the selling price of 5.66 yuan, and B also enters the selling price of 5.65 yuan, then B's declaration takes precedence over A's declaration. If both parties enter the same selling price, then whoever declares first will make a deal first. This situation is more prominent when the share price of a stock suddenly rises sharply or suddenly falls sharply.