One of the books they assigned to us was A Framework for Understanding Poverty by Ruby Payne. The book was about the differences between how working class, middle class and wealthy class saw the world and the norms they followed. For example, if you went to a party, the book claimed that you would judge the food differently based on your class:
quantity of food (working class)
quality of food (middle class)
The book went on to describe other differences including settling arguments (fighting, discussion, lawsuits) and meeting new people.
The author was exposed to all three worlds: she grew up middle class, married a guy who grew up working class, and then moved into a wealthy community where she was a fish out of water. It was fascinating to me, because I observed that fish out of water experience with my parents, both children of immigrants and both growing up in inner city ghettos and then moving into the middle class suburbs where the unwritten rules were different.