Solidarity and equivalence are long-term issues in all social systems in all countries. In reality there are a number of very close ties between them - to the excent that social systems are constructed as universal the principle of solidarity asserts itself, while to the extent that social systems are censtructed according to levels of income from economic activities the principle of equivalence asserts itself. Which those individual principles should be enforced that makes it such a fundamental question when deciding on modifications to social systems. Whithin the framework of the project, attention will be paid to both the "macroeconomic" viewpoit (the projection of income differentiation into defferentiation in social systems from the perspective of individual social groups) and the "microeconomic" viewpoint (the projection of income differentiation into differentiation in social systems from the perspective of the individual).

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