Parkinson's Law states that work is expanded to fill the available time. The law I refer to is that the time itself with work to be filled is expanded - for the purpose of requiring more human and non-human resources - which again requires expanding the hierarchy - which expands the power of those who cause this process (as the newly hired people will be added below those "managers").
Quite true. I should have italicized Parkinson's Law, the book. Parkinson spends a number of short chapters discussing the expansion of hierarchies, with historical examples.