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In his book _Guns, Germs, and Steel_, Jared Diamond writes about a similar
subject, breaking down social complexity based on size of the group. His
results extended to three tiers:

Size: Dozens
  Basically bands, no fixed home, "Egalitarian" leadership, no real
  bureaucracy, no laws, unstratified culture.
Size: Hundreds
  Tribes, a single home, "Egalitarian" or "Big Man," organized reesource
  extraction, still unstratified
Size: Thousands
  Chiefdoms, many homes, castes and classes, cronyism and monarchs,
  bureacracy and laws, taxes, indentured labor, slavery, public
  architecture, luxuries for the elite.

These examples, by the way, are taken from a presentation by Raph Koster
concerning competitive and cooperative structures in online worlds,
here (appears to be IE only):

- Andy Smith

Doug Fraiser wrote:

>Fractal theory has brought out that in many natural systems, the
>system's pattern of organization is constant over a certain range in
>scale but changes at particular threshold points.  Has anyone
>experimented with the idea that patterns of social networks are likewise
>constant over a certain range of scale (e.g., within groups ranging from
>5 to 500 members) but change at particular threshold points (at
>approximately 500 members, in the previous example)?
>Doug Fraiser

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