The Peter Principle, a 1969 book by Laurence Peter and Raymond Hull, which popularized the quote at this chapter’s start. The theory behind it is that each employee is judged for their next promotion based on their performance at the current one, rather than their potential aptitude for the new work required in that higher-up role. Hence, people advance at an organization until they are no longer competent in their positions, and the company is left with more and more incompetence at senior levels. It’s inevitable that this ugly scenario will occur if employees stop being promoted only after
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