Pareto's Principle is also known as:

"80/20" rule "20/80" rule "30/70" rule "50/50" rule

"80/20" rule

The principle is named for Vilfredo Pareto, an Italian economist who studied land ownership in Italy in the early 1900‘s and found that roughly 20 percent of the population held title to about 80 percent of the land. Legend has it that he further developed the theory upon observing that 20 percent of the pea pods in his garden produced 80 percent of the peas. For this reason, Pareto's Principle is often referred to as the "80/20" rule.