Abstract
This chapter aims at the concept of class. Many believe that this is a Marxist concept. A careful examination of the literature shows that this concept was born well before Marx. From Aristotle to Adam Smith, it has been shown that the concept of class is almost as old as human society. Thus, the class division has accompanied human culture from its very beginning. Similarly, as in other chapters, a mind genomics approach is provided as a quantitative evaluation of this social issue. The study evaluates who the people belonging to the lower, upper, and middle classes are.