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Noise is a secret destroyer of productivity.
It is secret because it impacts cognition, not effort, so we don’t notice, but a 10db noise increase (from a dishwasher to a vacuum) lowers productivity by 5%. Noise is also greater in poorer neighborhoods... https://joshuatdean.com/wp-content/uploads/2020/02/NoiseCognitiveFunctionandWorkerProductivity.pdf