2. Expedited meal delivery is introduced, and delivery fee is overcharged to ensure timely delivery. Many times, users are hungry and complain about the delivery staff when the delivery is overtime. Sometimes the restaurant cooks slowly and the delivery staff takes the meal late. Being complained once is a waste of time, and the distribution of responsibilities is unreasonable. If expedited food delivery is introduced to ensure timely arrival, but the delivery cost is high, users may feel unwilling to pay more and complain less.