[...] Marx suggests that social classes do not develop until there is a possibility of productive surplus; that is, not until an individual human being, on average, can produce more than he or she needs in order to survive. Once surplus is possible, this also opens up the possibility of one group, or class, living off the work of another class. Now the more productive society becomes, the greater the potential surplus, and the bigger and richer the exploiting class can become. Under capitalism one class lives a relatively leisured, potentially fulfilling, life, with the opportunity to pursue educa- tion, art, literature, and culture (whether or not they decide to avail themselves of this opportunity), while another class struggles to feed and clothe itself. However, once society becomes sufficiently productive it becomes, in theory, possible for everyone in society to lead a life finally worthy of human beings. Free from need, people can develop their individual potential.