Vilfredo de Pareto was an Italian sociologist and economist who, during his studies, realized that, in general, 80% of a nation’s income was in the hands of only 20% of the population.

Extrapolating this concept, Pareto defined a rule that became known as the Pareto 80 20 rule, which could be summarized as follows:

80% of results are produced by 20% of causes.

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