Discount lists are often referred to as volume discount lists. The key here is the word discount. Some organizations have a concept of volume pricing, whereby once a certain quantity of a product has been purchased, a new price will be set. For example, say 1 hour of consulting from Race2Win Insurance Company is USD 100. Now let's say there is a price break for anyone that receives 300 to 500 hours of consulting. Volume pricing dictates the new price to USD 90 per hour (a discount of USD 10).
CRM has a concept of volume discount which is different. Based on the quantity purchased, a discount is given of the price listed on the price list item. Using the previous example, if the rate charged for consulting is USD 100 per hour, and a customer purchases 300 to 500 consulting hours, then volume discount says the customer will get a USD 10 per hour discount.