Answer:
quantity discount
Explanation:
A quantity discount is a stimulus rendered to a buyer that brings about a decrease in cost per unit of goods or materials when purchased in greater numbers. A quantity discount is often rendered by sellers to attract customers to purchase in larger quantities.
The seller is able to sell off more goods or materials, and the buyer gets a more better pricing for them. At the consumer level, a quantity discount can appear as a BOGO (buy one, get one discount) or other incentives, such as buy two, get one free.