In 1906, Italian economist Vilfredo Pareto noted that 80% of Italy’* land was owned by 20% of the people. Pareto principle is a prediction that 80% of effects come from 20% of causes. The 80:20 ratio of cause-to-effect became known as the Pareto Principle. He became somewhat obsessed with this ratio, seeing it in everything. For example, he observed that 80% of the peas in his garden came from 20% of his pea plants.
