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How large can a social group with a given level of homogeneity get while maintaining that specific pattern of homogeneity? Has anyone studied this? Trivial example: If “Chinese” is your measure of homogeneity you too out at say 1.5b. Can’t have a 3b group of Chinese people.
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The subtler the features you care about in defining homogeneity, the smaller the scale band. In the limit, the group is immutable. Adding or (more subtly) dropping a single individual breaks it.
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