Groupthink is often influenced by this social psychological phenomenon, related to positive illusions.

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Overconfidence refers to a tendency for groups to believe that their decisions are always correct, leading them to ignore dissenting opinions and disregard potential negative consequences. This can contribute to groupthink, as members become more concerned with maintaining unanimity and avoiding conflict than with critically evaluating their ideas. Positive illusions may also contribute to overconfidence, as group members may believe themselves to be more capable or knowledgeable than they actually are.

Groupthink Is Often Influenced by This Social Psychological Phenomenon, Related