Why total agreement can actually be a sign of error

Should you trust unanimous decisions? - Derek Abbott · 4:03 · Video: TED-Ed · Watch at the source

In short: When a group reaches a unanimous decision, we tend to assume the conclusion is rock solid. However, this video explores the paradox of unanimity and why near-total consensus might actually indicate a lack of reliability.

Using the example of a police lineup where witnesses identify a suspect, Derek Abbott examines how group agreement functions. While six out of ten witnesses picking the same person suggests a likely culprit, reaching ten out of ten can be deceptive. The video explores the counterintuitive reality that as a group moves closer to total agreement, the result may become less trustworthy.

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