In every hierarchy, whether it be government or business, each employee tends to rise to his level of incompetence; every post tends to be filled by an employee incompetent to execute its duties.
Corollaries:
1. Incompetence knows no barriers of time or place.
2. Work is accomplished by those employees who have not yet reached their level of incompetence.
3. If at first you don't succeed, try something else.
Peter Principle