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English definition of “law of diminishing returns”

law of diminishing returns

noun [S]     (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 noun from the Cambridge Business English Dictionary © Cambridge University Press)
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