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The tendency to believe that deep expertise in one narrow field grants you objective authority on topics far outside that field. The physicist who speaks with unwarranted confidence about economics. The surgeon who thinks their medical training makes them an authority on education policy. The programmer who believes logical thinking in code transfers directly to understanding human relationships. Specialization creates genuine insight in a tiny domain, but the bias lies in assuming that insight generalizes—that the habits of mind that work in your corner of reality somehow make you immune to bias everywhere else.
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