The Pareto principle states that for many outcomes, roughly 80% of consequences come from 20% of causes (the “vital few”). Other names for this principle are the 80/20 rule, the law of the vital few, or the principle of factor sparsity.
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Mathematically, the 80/20 rule is roughly described by a Power law distribution (also known as a Pareto distribution) for a particular set of parameters. Many natural phenomena distribute according to power law statistics. It is an adage of business management that “80% of sales come from 20% of clients”.
Bibliography
“Pareto Principle.” 2022. Wikipedia, November. https://en.wikipedia.org/w/index.php?title=Pareto_principle&oldid=1119913844.