The Peter Principle
It describes what can happen when an employee does well in one job and is subsequently promoted. She/he does well in the new role and is promoted again. This continues up and until the employee is put in a position where she stops performing well and is, therefore, left in a position where she is incompetent.
"If you want to build a ship, don’t drum up the men to gather wood, divide the work and give orders. Instead, teach them to yearn for the vast and endless sea." - The little Prince
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