How many people? Everyone. Every single person is influenced, yet every single person claims to be the exception (“It might work on other people, but not me.”)
@LostInParadise: “but it is hard to imagine many people saying that they were uncertain what to buy until they saw an ad for a product.”
It isn’t designed to work this way, and it generally doesn’t. The ubiquity of marketing and the techniques that are used are designed to generate certain feelings of inadequacy and to tap into genuine human desires (to belong, to feel agency, etc). In a capitalist system, people are consumers. 95% of purchases are completely unnecessary, harm the planet and our psychological/spiritual well-being, and leave us needing to buy more. This is the purpose of advertising.
The specific brands or products are all swimming in this general marketing pool that we are all swimming in. We can’t help but be influenced by marketing overall, and the specific product marketing allows people the only type of meaning (they believe) is possible: consumption and defining ourselves by our consumption.
If you were completely off the grid, and never consumed corporate media with advertising or underwriting, you would be so out of the norm that you’d likely be an outcast on every possible level. You wouldn’t wear the clothes you currently wear, eat the food you eat, get around the way you currently do, etc. We can rationalize it and say, “Well, I would would live the same way had I not been exposed to a lifetime of marketing.”. But there is really no reason to believe this, and plenty of reasons to believe that we’re a result of decades of marketing.