Priority determines which special price takes precedence when the same product has two different price changes in effect at the same time. For example, Rose’s Ketchup is on special for $ .99 from 12/1/2021 to 12/8/2021. The same product has a temporary price reduction from the wholesaler, which is suggesting the price be $1.09 from 12/5/2021 to 12/13/2021. The user may determine that the ad should have priority, so assigns priority “1” to the ad and the wholesaler price a priority “2”.  So in this case, initially, the price is $.99 (i.e., from 12/1/2021 thru 12/8/2021). On December 9th the ad will have expired, and the temporary price reduction will take effect, and will continue to be in effect thru 12/21.