The Pareto principle (also known as the 80/20 rule and the law of the vital few) states that in many things, 80% of the consequences come from 20% of the causes.
Vilfredo Pareto, an Italian economist is credited with it. He observed that 80 percent of the land in England (and every country he subsequently studied) […]

The Pareto principle (also known as the 80-20 rule and the law of the vital few) states that in many things, 80% of the consequences come from 20% of the causes.
Vilfredo Pareto, an Italian economist is credited with it. He observed that 80 percent of the land in England (and every country he subsequently studied) […]