<P> The Pareto principle (also known as the 80 / 20 rule, the law of the vital few, or the principle of factor sparsity) states that, for many events, roughly 80% of the effects come from 20% of the causes . Management consultant Joseph M. Juran suggested the principle and named it after Italian economist Vilfredo Pareto, who noted the 80 / 20 connection while at the University of Lausanne in 1896, as published in his first paper, "Cours d'économie politique". Essentially, Pareto showed that approximately 80% of the land in Italy was owned by 20% of the population; Pareto developed the principle by observing that about 20% of the peapods in his garden contained 80% of the peas . </P> <P> It is a common principle in business management; e.g., "80% of sales come from 20% of clients ." Many business executives have cited the 80 / 20 rule as a tool to maximize business efficiency . Richard Koch has authored a book, The 80 / 20 principle, demonstrating the practical application of the Pareto principle to business management and life . </P>

Where did the 80 20 rule come from