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The rich-men theory holds some water for me. Compared to rich men, poor men were probably killed disproportionately in war before reaching optimal child-rearing age; after combat, male children were probably killed/enslaved and female children taken as courtesans by the winning army leaders; poor families may have sold girls to rich men in return for resources and favours; the children of men who were poor were probably much less likely to survive childhood, and thus much less likely to pass on their genes. Although I’m not sure why this happened specifically to the 6,000s AD.

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