re: Medieval farmers ate 7000-9000 calories a dsy

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And add the logic problem: if you need to burn 5 or 6k extra calories for no other reason than to provide yourself with an additional 5-6k calories, at some point, an equilibrium will be met. People as a whole won't continue to work harder than they have to for no other reason than to provide the extra calories they need just to do extra work.

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