Starting out years ago, I had no real clue about this. One of my early bosses even traveled with me for two weeks to train me because I wasn't making the numbers he wanted. I had to be trained to understand what really was causing people to buy certain things. And it surprised me to see it is NOT logic.
Today, every product, service or app that is selling well online or offline, addresses at least 2-3 of the list of 10 reasons people buy. If you want to sell your business at any time or you want to sell a bunch of product to another business, this will help.