Meaning of “law of diminishing returns” in the English Dictionary

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"law of diminishing returns" in Business English

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law of diminishing returnsnoun [ S ]

uk us also law of marginal returns

ECONOMICS the principle that after a certain point more work, investment, etc. produces smaller and smaller improvements or results:

None of the managers could supervise more than 30 workers before the law of diminishing returns took effect.

(Definition of “law of diminishing returns” from the Cambridge Business English Dictionary © Cambridge University Press)