Which came first, demographics or pop culture?

Demographics are the categories used to group people for marketing purposes. Demographics can include, but are not limited to; age, generation, race, religion, economic status, marital status, child rearing status, education, and location. These factors are very important to advertising. Ad/marketing researchers use these categories to try to increase the success of their advertisements by concentrating their efforts on a very specific group of people. Where ads are placed and what stations they run on is not accidental. Advertisers attempt to place their ads in a place where their target audience will be most exposed to them. The ads are designed to impact this specific primary audience. As an overall rule, most ads are constructed to appeal to the lower to middle upper class because they represent the purchasing power of the majority of the products that are being marketed, however this large group is broken down into sub categories as mentioned above for the purpose of specific target marketing.

I feel that the American idea of demographics significantly affects pop culture, or more accurately, they affect one another. It is a question of "which came first..." and more often than not, there is no correct answer. It stands to reason that they influence each other and feed off one another in a cyclical and symbiotic sort of relationship.