In
anthropology and
archaeology, a complex society is a social formation that is otherwise described as a formative or developed
state (i.e. a
civilization, to use an old-fashioned term). Social complexity in this sense thus refers typically to political complexity, specifically the presence of a
hierarchy in the form of a ruling
elite supported by
bureaucrats, with associated paraphernalia such as administrative buildings and elite residences in urban or proto-urban population centres. Complex societies under this definition are also
agricultural to provide the surplus required to support a social (non-food producing) elite. Explaining the origins of these types of social formations, which appear in many areas of the world, is one of the tasks of
archaeology.
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