5000 yuan is calculated according to the percentage of the stock you buy. For example, when the stock rises 10%, it is 5000* 10%. Generally speaking, it is the concept of paying equal attention to both profit and loss. A stock can earn at most 10% and lose at most 10% a day, so the landlord can calculate the profit and loss problem between 5000* 10%~(- 10%) by himself.