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the 80/20 rule

 
 
noun [S] (also the 80/20 principle) MANAGEMENT

Definition

a principle stating that 80 per cent of problems or effects come from 20 per cent of causes for a particular event: Use the 80/20 rule to increase your website’s effectiveness by focusing on the 20% that will bring you 80% of the results.
(Definition of the 80/20 rule noun from the Cambridge Business English Dictionary © Cambridge University Press)

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