What bias would lead a group to ignore unique minority perspectives?

The correct answer is common-information bias. This bias occurs when group members focus on information that all of them are aware of while neglecting unique insights or perspectives that are not shared or discussed as widely within the group. As a result, critical minority viewpoints may be overlooked, leading to less diverse and potentially less effective decision-making.

Common-information bias arises in group settings where members tend to favor information that is shared and readily available among all participants, rather than considering unique contributions from individuals. This phenomenon can stifle creativity and innovation because it limits the range of ideas considered and can reinforce conformity among group members. Consequently, this bias can hinder the ability to fully utilize the diverse knowledge and experiences that minority perspectives bring to a discussion.

In contrast, disconfirmation bias involves favoring information that confirms existing beliefs; anchoring bias relies heavily on the first piece of information encountered; and availability bias centers on the most easily retrievable information, which does not specifically address the issue of minority perspectives being ignored. Thus, common-information bias directly relates to the tendency to overlook unique contributions in a group context, making it the appropriate choice.