What influences you the most?

While reading the chapter, I starting thinking to myself what influences me the most to buy a product. I starting thinking that the product itself is the most important to me but then I looked around my room and at my personal belongings and saw that I had a lot of brand name products. I realized that I would normally spend the extra dollar or so to buy the snack, item of clothing or whatever it was if I felt that it would differ from a different product? Do you do the same or does the packaging or the actual product itself move you the most?