The Pareto Principle, or 80/20 rule, asserts that 80% of outcomes stem from 20% of causes. Introduced by Italian economist Vilfredo Pareto, who noted that 80% of Italy's land was owned by 20% of the ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Robert Kelly is managing director of XTS ...

Vilfredo Pareto noticed in 1896 that 80% of the land in Italy was owned by 20% of the population. A century later, quality engineer Joseph Juran generalized the observation into the Pareto principle: ...