“Inequality, when it refers to social problems, is a word which rather readily excites passions. During at least two centuries it remains a permanent matter of a great number of economic, sociological, and in some cases even political works. The phenomenon of inequality is perceived often almost as a synonym of ”injustice”. That is unjust, however, because since Adam Smith it is clear that inequality plays really the dual role. On the one hand, inequality is a mechanism of development, and on the other a standing source of poverty and social tensions. An ever-growing degree of inequality that accompanies rapid development of contemporary economy excites both the general public and experts in sociology and economy. Inequality in society has indeed two aspects: social and economic one. The former manifests itself in the difference of living standards of various social strata of society: the real disparity in housing conditions, in the accessibility of education, adequate medical care, legal protection, and the like. On the economic plane, inequality is expressed in the disparity of incomes.