I read Aristotle's Meteorology and found the chapter on the perfection of the universe. Aristotle cultivates a dialectic in which the state shares the rich and the poor. It is not excluded that Marx, as a dialectic, suggested Aristotle, and on that basis introduced the notion of class struggle. But you can look at the state from the perspective of set theory, in which we classify occupations. In order for a state to function efficiently, the class must cooperate to perform a product. For this reason, the dialectic approach to the state is, in my opinion, incorrect, as the professions support one another and the performance of the product is conditional on the cooperation of the individual professional classes and their conformity. However, it can not be confused with free competition, as it refers to one professional class in a given area. To calculate the competition, divide the population of a given area by, for example, the number of electric stores in a given area.