Answer:
The Marxist school follows a process of thinking called the material dialectic. This belief system maintains that "...what drives historical change are the material realities of the economic base of society, rather than the ideological superstructure of politics, law, philosophy, religion, and art that is built upon that economic base" (Richter 1088).
Marx asserts that "...stable societies develop sites of resistance: contradictions build into the social system that ultimately lead to social revolution and the development of a new society upon the old" (1088). This cycle of contradiction, tension, and revolution must continue: there will always be conflict between the upper, middle, and lower (working) classes and this conflict will be reflected in literature and other forms of expression - art, music, movies, etc.