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Your premises are flawed. Human brain power is not an additive substance. So 1000 brains are in no sense of the term 1000 times more powerful than one brain.

Crowds don't actually have wisdom. All they really have is consensus.

As such, if a problem is the kind of thing that one person usually gets wrong, then it's also the kind of thing that the majority of a million-person crowd will also get wrong.

This. Each brain acts independently, and some brains have access to rather more or less data (and yes, processing power too) than others when it comes to making a decision on any given subjects. It's more of a surprise when the majority chooses correctly given superficially-appealing conflicting arguments on esoteric subjects it doesn't really understand.

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