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Social stratification refers to a society's categorization of its people into groups based on socioeconomic factors like wealth, income, race, education, ethnicity, gender, occupation, social status, or derived power (social and political). It is a hierarchy within groups that ascribe them to different levels of privileges.[1] As such, stratification is the relative social position of persons within a social group, category, geographic region, or social unit.[2][3][4]
In modern Western societies, social stratification is defined in terms of three social classes: an upper class, a middle class, and a lower class; in turn, each class can be subdivided into an upper-stratum, a middle-stratum, and a lower stratum.[5] Moreover, a social stratum can be formed upon the bases of kinship, clan, tribe, or caste, or all four.
The categorization of people by social stratum occurs most clearly in complex state-based, polycentric, or feudal societies, the latter being based upon socio-economic relations among classes of nobility and classes of peasants. Whether social stratification first appeared in hunter-gatherer, tribal, and band societies or whether it began with agriculture and large-scale means of social exchange remains a matter of debate in the social sciences.[6] Determining the structures of social stratification arises from inequalities of status among persons, therefore, the degree of social inequality determines a person's social stratum. Generally, the greater the social complexity of a society, the more social stratification exists, by way of social differentiation.[7]
Stratification can yield various consequences. For instance, the stratification of neighborhoods based on spatial and racial factors can influence disparate access to mortgage credit.[8]