Prices can be changed based on a variety of variables. These variables include date range, day of the week, and hour in a day (time and date to start and end). When creating the schedule, the prices can be changed collectively by a discount %; discount by fixed price; setting margin to a fix %; change price manually; set the price to be a % above cost. Additionally, items and groups of items can be marked to be on a No Sale for a schedule. In all instances it is possible that multiple schedules are created that may conflict with one another. At all times the system will calculate the best price for the customer.