The same product can do well with one group of people and fail completely with another because different people have different needs, income levels, and buying habits. A bag shown to young students will not perform the same way as when it is shown to working professionals, even if it is the same bag. Ads work best when they speak directly to what a specific group of people care about. Targeting the wrong audience is one of the biggest reasons businesses waste money on ads. What do you think makes audience targeting so hard to get right?