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> Where are you seeing the author suggest most people in the described jobs could actually be replaced by rocks?

I really think it's harder to get more literal than this:

> He could be losslessly replaced by a rock with the words “THERE ARE NO ROBBERS” on it.



A guard who adopts the heuristic "there are no robbers" can be replaced with a rock, but has adopted a heuristic that almost always works.

Guards that do not adopt that heuristic cannot be replaced by that rock.


I think the point is that the person who inappropriately uses a heuristic instead of doing their job, is in fact, not doing their job.




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