There are a lot of studies on effects of marketing such as brand recognition leading to purchases. I’d like to put the onus on you to do a bit of Google research it the topic interests you. I don’t have any links at hand and I’ve only looked into the topic some years ago. I remember being shocked at the effectiveness of some methods on certain groups of people.

But I think a ton of market research isn’t public as the companies want to make money off of it so they don’t release it.