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English definition of “the 80/20 rule”

the 80/20 rule

noun [S]
 
 
(also the 80/20 principle) MANAGEMENT
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 from the Cambridge Business English Dictionary © Cambridge University Press)
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