The 80/20 rule states that 80 percent of the effects of something come from 20 percent of the causes.
The 80/20 rule is also known as the Pareto Principle after the Italian economist, Vilfredo Pareto, who first mathematically analyzed the distribution of wealth in Italy.
The 80/20 rule helps prioritize improvement efforts. Working on the critical few causes, the 20%, can yield big gains.
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