The idea, which is confirmed by research and one of my favorite books of all time, is that a larger group of people of varying skill sets will reliably make better decisions than a smaller group of experts.
The Real Reason Quirky Failed
Ben Einstein

Actually, the “wisdom of crowds” research deals more closely with making estimations/predictions, from which one cannot just extrapolate onto creative endeavors such as ideation, brainstorming, or whatever one wants to call it.

When it comes to brainstorming, research shows that group creation settings are inferior to individual brainstorming that is followed by group analyses about the individual ideas, as this reduces various adverse biases (the most well-known one being groupthink) that tend to arise in group settings.

Generally speaking, group estimates derived from large (either random, or, if applicable, representative) samples of independently made individual estimates will, on average, outperform any expert. But brainstorming in groups violates the statistical independence requirement.

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