In social sciences the most disaggregated level is the one of single individuals, whose micro-interactions generate social organizations, whether large or small: from families to groups of friends, to political parties, companies, administrations, etc. On their turn, inter-organizational relationships produce systems with a higher aggregation level, such as industrial clusters, cities, etc. At an even higher level, inter-organizational networks interactions produce other more aggregated systems, i.e. regions, states and over-national organizations.

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