Pareto's Principle, also known as the 80/20 rule

Pareto's Principle, also known as the 80/20 rule, was discovered by Italian economist Vilfredo Pareto. It is a power law distribution that states that approximately 80% of the effects come from 20% of the causes.


Pareto analyzed income statistics and concluded that income distribution is stable and does not change over time. However, he acknowledged that Pareto's Principle does not apply to the low-income group. Today, Pareto's Principle is considered valid only locally for income distribution.


Pareto's Principle was supported by the Italian Fascist Party as a theory justifying the rule of the majority by an elite minority.


Pareto's Principle suggests that about 20% of the key people in an organization bring most of the benefits, and when that 20% of key people are culled, 20% of the remaining 80% will again bring most of the benefits. This principle is often applied to various examples beyond economics, such as natural phenomena and social phenomena.

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