One of the possible downsides of a decision by unanimity is that it can lead to groupthink.

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When a group is required to make a decision unanimously, there may be pressure on individuals to conform to the group's opinion rather than expressing their own. This can lead to a phenomenon known as groupthink, in which the group makes a decision that is not optimal due to a lack of critical evaluation of alternatives.

One of the Possible Downsides of a Decision by Unanimity