The second reason is subtler. There are many excellent people who, despite not being world-class, can achieve 10x output in certain situations, but that output may not be replicated when they switch roles, projects, or organizations. In other words, when you see outsized output by an individual, such as on a resume or via a reference, it is usually because they have many things working in their favor all at once to produce that outsized impact: role in the organization or team, personality as applied to this role, types of tasks assigned, resources provided, and the value of their unique set
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