Hypothesis: It's because the women don't get killed, and because the women are so persuasive.
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Maybe the cattle (or goats or sheep) got fatter if they didn’t go on long migrations.
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Hypothesis: Pastoralism can support a larger population than hunter-gathering, and sedentary agriculture can support a larger population than pastoralism. Hence, there's no going back, unless a big chunk of your populace has already died due to some disaster.
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Also, the sedentary farmers can support a larger population, but pastoralist societies still have a military advantage as long as they're on flat open land.
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