How come height doesn't serve as a basis for identity group formation the way skin color, gender, or even weight do? Why don't shorter-than-average people pursue collective action?
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I’ve wondered about birth-order along those lines. First-borns surely have more in common with each other statistically than any supposed racial grouping, for instance.
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That one is easy. Birth order is not a visible trait like skin color and personality effects are too fuzzy to be reliable indicators.
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Yeah, if it could be a factor it would already have been. It just seems more justified if commonality, rather than ease-of-identification, were the determining factor in social ordering. No surprise it is not...

