"Automating most tasks within a job can make the remaining human tasks more important rather than irrelevant."
McAfee applies Michael Kremer's O-Ring production model to explain why the quality of a single remaining task can constrain the performance of an otherwise automated process. As machines improve performance across other tasks, the remaining human contribution can become disproportionately valuable. This supports the book's argument that complexity and responsibility can concentrate in the work that automation leaves behind.
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