The increase is the extent of the stock's rise, that is, how many points it has risen, usually expressed as a percentage. Compared with the previous trading day, the fluctuation is 10%. The increase is a relative value. We usually say that the increase is mostly for the closing price of the previous trading day. Of course, it can also be used to compare with any previous price. For example, how much has futures risen this year? It can also be used to compare with the same type of futures products, such as other futures products that have risen more than the industry sector.