Is there a saying (ことわざ）or 4 character phrase (四字熟語) in Japanese for the 80-20
rule (i.e. the Pareto Principle)? i.e. it takes 20% of the effort to get 80%
of the results but to get the last 20% of the results takes 80% of the effort.
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2020-01-13T02:20:15.700
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expressions yoji-jukugo
80/20 rule expression (Pareto Principle)
What you describe is also known in English as the Pareto principle.

From this site <https://takuminotie.com/blog/2015/09/09/post-9226/>

we have the usage

> パレートの法則

The site also says that...

> それで、これらは俗に80対20の法則、2：8の法則、80-20ルールとも呼ばれる。
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2020-01-13T13:52:17.800
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answer