Every group, if it is a real one—that is, one made up according to the ability of the individuals who compose it—must necessarily be hierarchical.
But there are considerable obstacles to the realisation of this hierarchy:
(1) First, when the group is incomplete—that is, when it does not have all the members necessary to constitute the hierarchy and certain functions or intermediaries are missing.
(2) The indiscipline of certain members refusing wholly or in part to occupy the place assigned to them.
When order and harmony are established, the hierarchy is organised quite naturally and spontaneously.
Ref: Some Answers from The Mother