A form of advertisement I always think about is product placement. I never really notice it unless they really put the product front and center. Many articles that I’ve read about it say it works, but I think it depends on the person and how observant they are. I’m still not 100% sure how it works but I’ve always thought of it as an interesting way of advertising a product.
Here are a few articles I’ve read if you’re interested.
https://chrisdeblasio.com/2018/09/14/product-placement-branded-entertainment-still-works/
KC Miller's Mass Communications 