Today's researchers would call this the false consensus effect.
The significance of this illusory consensus is that it raises self-esteem (overconfidence effect). It can result from a desire to fit in and get the approval of others in a social setting.
This bias is particularly widespread in group settings when people tend to believe that the opinions of their own group as a whole reflect the views of the whole public. Since they rarely come across people who disagree with their consensus, group members often assume that everyone shares that viewpoint.
Although the false-consensus effect can occur when people assume that the majority shares their values, it can also occur when people overestimate how strongly they believe something.
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