Answer:
Inert set
Step-by-step explanation:
In business, Inert set refers to a brand which is known by the customers, but doesn't become customers' first option to buy. That being said, Brands that considered as inert set for the customers tend to be varied depending on their preference.
Typically , iner set is regarded as a 'Substitute' and only bought by the customers if somehow their preferred brand is out of stock or they do not have enough money to buy preferred stock.