80/20 principle? No, the 60 to 1 rule. Duh! Published July 27, 2018 at 810 × 450 in 80/20 principle? No, the 60 to 1 rule. Duh! 80/20 principle? No, the 60 to 1 rule. Duh! 80/20 principle? No, the 60 to 1 rule. Duh!