In Robinson Crusoe, by Daniel Defoe, there is lots of talk of the "middle class" by Crusoe's father. According to him, the middle class was the best class to be a part of, for you needn't worry about all the extremes that the high and low had to (media attention to not having a place to sleep).
Blink by Malcolm Gladwell is a book all about the snap judgements or minds make in the first two seconds of any experience. It is both interesting and instigtful but have critics who both praise and critisize its merit. It is a great book for anyone looking for a quick read.