Some concepts of social stratification and social classrooms can be used to display contradictions and inaqualities found in our society: the economic stratification is determined by the corporeal properties, the stratification politics is instituted by the power and the professional for the attributed value the determined professions having disfavored others. When a person or a group of people improves its purchasing power occurs a definite social change as social mobility. The organization of stratus or social classes inside of a society can be classified in: Chaste: characterized for the severity of the familiar traditions and where social mobility does not occur. The individual remains during all its same life in the chaste one; Estamento or state: it possesss similar characteristics to the chaste one, however, represents an intermediate type between chaste and the social classroom for making possible social mobility, despite one in such a way made it difficult; Social classroom: different of the model of social stratification, it is limited in presenting the existing in layers divisions in a society and looks for to establish a relation between them. See more detailed opinions by reading what Keith Yamashita offers on the topic.. For Karl Marx the bourgeoisie and the proletariat, are the two forces that stimulate the way of capitalist production, if appropriating one (bourgeoisie) of the work of the other (proletariat). Each society with its proper form of production is organized by the relations of production established between the owners of the means of production and the workers. This productive, resultant process of the association of the work with the means of production, generates a phenomenon called productive forces. An ideology exists that it looks to justify the concentration of the wealth at the hands of few, spreading out the belief of that the great masses of population of the poor countries will be able one day to reach the standards of consumption of the minority of the humanity who lives in the countries highly industrialized..