Question

Why might a commercial use a literary device such as repetition when advertising a product?

Answer 1

They could use repetition to make sure their point gets across.

Hope this helps :)

Answer 2

Repetition is when the same phrase or concept is repeated. It is often used in advertising to drive the point home and get ahead of competitors. If you keep telling your audience the benefits of your product in the same phrase, they will tend to remember it. Also, repetition of certain phrases also allows consumers to remember your brand name.