A cognitive and social tendency to instinctively side with, trust, and defer to the perceived majority opinion within a group, regardless of the opinion's factual or ethical merits. It's the mental shortcut that "if most people believe it, it must be true/safe/right." This bias underpins conformity, groupthink, and the chilling effect where dissenting voices are silenced not by law, but by the sheer social weight of assumed consensus.
Example: In a meeting, even members who privately doubt a plan will remain silent and eventually agree once they perceive (rightly or wrongly) that "most people" are for it. This Majority Bias creates false unanimity and leads to disastrous decisions because the actual distribution of critical thought is hidden by the fear of being the outlier.
by Abzugal Nammugal Enkigal February 4, 2026
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