Superiority bias is when people think too much of themselves without good reason. They overrate their positive qualities and abilities, and underrate their negative qualities (relative to others). Other phrases for this are: illusory superiority, the above average effect, leniency error, sense of relative superiority, the "primus inter pares" effect, and the Lake Wobegon effect. This was named after Garrison Keillor's fictional town where "all the children are above average".