In sufficiently large bureaucracies the departmental budget is someone else's money, but meanwhile the departmental middle manager has to prove his need for exi

In sufficiently large bureaucracies the departmental budget is someone else's money, but meanwhile the departmental middle manager has to prove his need for existence, so why not advertise for a position. You see this often in universities: someone leaves, the duties are distributed amongst those that are still there, a job is advertised and goes unfilled for several terms because none of the applicants are to the taste of the committee.