The 80/20 rule says that for many events, roughly 80% of the effects come from 20% of the causes. It is an observation; Not a law of nature. Also called the law of vital few and trivial many. Several phenomena tend to exhibit this pattern. It was first noted by Vilfredo Pareto while observing the wealth distribution in Italy. If you are interested in learning more about the 80/20 principle, check out
The 80/20 Principle: The Secret to Achieving More with Less
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Prelude No. 12 by Chris Zabriskie is licensed under a Creative Commons Attribution licence (
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