employers, who expropriate the surplus created by others and generate alienated labourers. In Marx's view, alienation is an objective characterization of the worker's situation in capitalism—his or her self-awareness of this condition is not prerequisite. In addition to criticism, Marx has also praised some of the results of capitalism stating that it "has created more massive and more colossal productive forces than have all preceding generations together" and that it "has put an end to all feudal, patriarchal arrangements." Social classes Marx distinguishes social classes based on two criteria, i.e. ownership of means of production and control over the labour power of others. Following this criterion of class based on property relations, Marx identified the social stratification of the capitalist mode of production with the following social groups: Proletariat: "[T]he class of modern wage labourers who, having no means of production of their own, are reduced to selling their labour power in order to live." The capitalist mode of production establishes the conditions that enable the bourgeoisie to exploit the proletariat as the worker's labour generates a surplus value greater than the worker's wage. Lumpenproletariat: the outcasts of society, such as the criminals, vagabonds, beggars, or prostitutes, without any political or class consciousness. Having no interest in national, let alone international, economic affairs, Marx claimed that this specific sub-division of the proletariat would play no part in the eventual social revolution. Bourgeoisie: those who "own the means of production" and buy labour power from the proletariat, thus exploiting the proletariat. They subdivide as bourgeoisie and the petite bourgeoisie. Petite bourgeoisie: those who work and can afford to buy little labour power (i.e. small business owners, peasants, landlords and trade workers). Marxism predicts that the continual reinvention of the means of production eventually would destroy the petite bourgeoisie, degrading them from the middle class to the proletariat. Landlords: a historically significant social class that retains some wealth and power. Peasantry and farmers: a scattered class incapable of organizing and effecting socioeconomic change, most of whom would enter the proletariat while some would become landlords. Class consciousness denotes the awareness—of itself and the social world—that a social class possesses and its capacity to act rationally in its best interests. Class consciousness is required before a social class can effect a successful revolution and, thus, the dictatorship of the proletariat. Without defining ideology, Marx used the term to describe the production of images