Trying to breed e.g. egg-laying chickens by individual selection can produce odd side effects on the farm level, since a more dominant hen can produce more egg mass at the expense of other hens. Group selection is nearly impossible in Nature, but easy to impose in the laboratory, and group-selecting hens produced substantial increases in efficiency. Though most of my essays are about individual rationality - and indeed, Traditional Rationality also praises the lone heretic more than evil Authority - the real effectiveness of "rationalists" may end up determined by their performance in groups.
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