Final answer:
Discounts that apply to purchases over a certain period of time are known as promotions or sales events.
Step-by-step explanation:
Discounts that apply to purchases over a certain period of time are known as promotions or sales events.
These discounts are often offered by retailers or businesses as a way to attract customers and increase sales.
The duration of these promotions can vary, but they typically last for a limited time.
For example, a clothing store might have a weekend sale where all items are 20% off. This discount would only apply for that specific weekend, encouraging customers to make purchases during that time.