Critics have argued that this concentration of power has contributed to a string of accounting scandals and corporate failures in recent years.

First and foremost, it's an undue concentration of power.

This concentration of power has required willpower and charisma.

Those who could write, who could count, who could print, who could read, enjoyed a concentration of power that technology diluted.

He was thought to have grown frustrated at the concentration of power at the top of the group.