Marxist definition In Marxist theory, classes are not defined by its position in linear scales of power, prestige or wealth but for its structural role in the relations of production (ie expenses). The social relations of production that form the basic structure of society, are defined by the use and possession of means of production, ie, those goods are not intended for direct consumption, but are used to produce other property. The control over them, which is relatively independent of the volume of consumption determines the future development of production. Although Marx does not present at any time a formal theory of social classes was working on it at his death, the idea of class is fundamental in all his work. The Communist Manifesto states that “the history of all hitherto society is the history of class struggle.”In many parts of his work is elaborated the concept of class from the notion that the relationship between the productive classes that defines the course of history, the theory called historical materialism. In capitalism, unlike earlier forms of production, relations of economic production completely and utterly defined social structure, while in feudalism, for example, apparently noneconomic factors, such as the establishment (legal inequality), influenced the social position under capitalism it is entirely determined by the possession of means of production and working methods (economic inequality). The statutory position becomes full in class situation, and all social benefits depend solely on the possession of the means of production. That is, what defines the class is not simply what one has, but what is done, the activity in which the person occupies.In the Marxist scheme, the capitalist structure is divided simply between proletarian or workers, ie people whose only possession is their own labor and the capitalists or bourgeois-that is, those whose ownership of the means of production defines their position in economic exchanges, to let them use their wealth to increase the flow of it through the exploitation of labor of workers. Like other class-the landowners, for example, the middle class in the Marxist sense is a remnant of the past, which remains temporarily in the capitalist system. Marx considered consists of those who have some ownership, but not enough to devote themselves entirely to the exploitation of the working class (notice the difference with Weber, who believed that owners who had to devote his time to the business were also somehow, part of the middle class).The relationship of the petty-synonymous, in Marx, of the middle class to work is therefore ambivalent defends private property of means of production, but is opposed to the political principles of the bourgeoisie, supported the unrestricted liberalization, being aware that it is unable to compete with that. This ambiguity, reflected in internal conflicts, reduces the role of this class as a political actor, in so far as it has its own character, the petty bourgeoisie is reactionary, advocating the return of the old means of social control that limited development of capitalism. According to forecasts of Marx, the petty bourgeoisie tend to disappear, being absorbed the most successful members in the bourgeoisie, according to the law of concentration of capital, while most of them are proletarizar a.The Marxist theory back often be interested in the surprising persistence of the middle class, many studies have attempted to show that, in accordance with the provisions of Marx, this was in fact disappearing. The radical increase in the difference between the top and bottom income appeared to confirm this hypothesis. Other theoretical options have tried to describe theemergence of “new middle class” comprised of white collar professionals, the growing ranks of bureaucrats and clerks, and the “labor aristocracy”, giving rise to post-Fordist theories. Others, finally, said the opposition within advanced societies are taken to see global relationships, fulfilling the polarization between core and periphery countries of the world temporarily the role of the radicalization of the conflict between proletarians and capitalists within same society.In conclusion we can define the middle class, according to Marxist theory, as one social sector workers who own their own means of production, or the opposite: that social sector of the owners of the means of production, whose fortune does not give to hire workers, so it is the same media who works and is engaged in the production of goods.