The Pareto principle, also known as the 80/20 rule, states that 80% of outcomes come from 20% of causes. This principle was first observed by Vilfredo Pareto, an Italian economist, in the late 19th century. Pareto noticed that 80% of the land in Italy was owned by 20% of the population.
Mastering Pareto: Exploring the Legacy of Vilfredo Pareto in Sociology and Economics