The energy of the stock market refers to the trading volume. Volume reflects the number of transactions, which can generally be measured by two indicators: the number of shares traded and the amount of transactions. Volume is a manifestation of the relationship between supply and demand, which refers to the number of transactions in a time unit.

When the stock market is in short supply, the crowd is surging, and everyone wants to buy it, so the trading volume will naturally increase; On the contrary, the supply exceeds the demand, the market is deserted, the buying gas is scarce, and the trading volume will inevitably shrink. Digitizing the crowd is the transaction volume.