noun
Pareto principle; 80-20 rule
Economic and business principle that roughly 80% of effects come from 20% of causes. Often used in productivity and quality control contexts.
売上の8割は、2割の商品から生まれている。これはパレートの法則の一例だ。
80% of sales come from 20% of products. This is an example of the Pareto principle.