Have you noticed a growing trend in our society to classify people according to personality types as if we are trying to find a niche for every itch? For example, in the world of advertising, there is a theory that divides people into different groups based on their supposed lifestyles. For example, two of these groups are called the belongers and the achievers. Belongers are middle-class folks who want more than anything else to do the accepted thing. Therefore, to sell a product to people in this group an advertiser will stress that the product is the most popular product of its kind. That same pitch would not work with a group of achievers, however. Achievers, so the theory goes, are financially successful people who would not want to buy the most popular product. They only want to own …