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Lawrence J. Peter introduced a principle that struck a universal chord when he published the Peter Principle. The Peter Principle was simple and relevant to everyone working in a bureaucracy. It said that in a hierarchy, every individual rises to a level of incompetence and advances no further. It applied to both public and private institutions.
Keeping the Peter Principle in mind, you’ll recognize that a person who has reached a level of incompetence often becomes an obstacle to greater performance or change. Hence, a corollary to the Peter Principle exists: a person who reaches a level of incompetence is an obstacle to progress. They’re like brick walls that won’t let anything pass. These people are often negative, even hostile, because they do not want anyone to surpass them or upset their position, which would only reinforce their feelings of incompetence and may threaten their position.