If we are going to consider promotions, we have to consider the Peter Principle, which says that when someone is good at his job, he is promoted; he keeps getting promoted until he reaches his level of incompetence and then stays there. Like all good caricatures, this one captures at least some of what really happens in a merit-based promotion system. Take a look at the illustration opposite, where we track someone’s promotions. At point A the demands of Job 1 so tax him that he can only perform in an average fashion. In the jargon of performance assessment, he “meets the requirements” of the
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