Some classical theorists accepted that a tall organisation structure is inefficient, because:

A manager in a flat organization possesses more responsibility than a manager in a tall organization because there is a greater number of individuals immediately below who are dependent on direction, help, and support.

A tall organisation is one which, in relation to its size, has a large number of management hierarchies, whereas a flat organisation is one which, in relation to its size, has a smaller number of hierarchical levels.