One of the papers in this colloquium lays out how complete integration (at least of a spatial kind, the way we think of real estate markets) is kind of impossible as long as the individual agents show any preferences for their own tribes. Even small preferences will lead to segregation over time. In other words, if individual agents are unwilling to be completely surrounded by people not of their own tribe, then segregation is inevitable, unless there are also larger disturbances that re-mix the system.
http://www.pnas.org/content/99/suppl_3#ColloquiumPaper
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Great resource, I'll have to take some time to go through it all, I didn't see the one you're referring to yet. I was immediately struck by this one though
http://www.pnas.org/content/99/suppl_3/7257.full
Which claims that entities composed of active agents can be considered active agents themselves.
If I remember which one it was I'll post a direct link.