Illusion of asymmetric insight

The illusion of asymmetric insight is a cognitive bias whereby people perceive their knowledge of others to surpass other people's knowledge of them. This bias "has been traced to people's tendency to view their own spontaneous or off-the-cuff responses to others' questions as relatively unrevealing even though they view others' similar responses as meaningful".
Study.
A study finds that people seem to believe that they know themselves better than their peers know themselves and that their social group knows and understands other social groups better than other social groups know them. For example: Person A knows Person A better than Person B knows Person B or Person A. This bias may be sustained by a few cognitive beliefs, including:
A group of studies, performed by Pronin, Kruger, Savitsky, & Ross (2001), points to several different manifestations of the illusion of asymmetric insight: