https://aeon.co/essays/a-mathematical-bs-detector-can-boost-the-wisdom-of-crowds
"One reason that crowds mess up, he notes, is the hegemony of common
knowledge. Even when people make independent judgments, they might be
working off the same information. When you average everyone’s judgments,
information that is known to all gets counted repeatedly, once for each
person, which gives it more significance than it deserves and drowns
out diverse sources of knowledge. In the end, the lowest common
denominator dominates. It’s a common scourge in social settings: think
of dinner conversations that consist of people repeating to one another
the things they all read in The New York Times."
Solution? Sort out who actually knows pertinent things and give their view more weight.
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