It is necessary to increase the facade rent during the epidemic period, and it is reasonable to increase the incremental fee according to the contract. Incremental charges refer to the annual adjustment of charges according to market conditions. Generally, it is agreed at the time of signing the contract, and it will increase every year. The details are different in different formats, but it can be understood as the last cost 100, the current cost is 200, and the next cost is 300. This form is the concrete embodiment and significance of incremental fee.