People are largely motivated by social hierarchies. This is a bias because this dynamic is hidden from us and there are reasons for that.
This bias is explained in
Why this is hidden:
- If we have hidden motives we are more effective at presenting them as central if we do believe they are central
In primatology almost everything is viewed through a perspective of a hierarchy in the group. In social sciences, when we talk about humans, in most cases hierarchy is not even mentioned. – Frans de Wall