The Pareto Principle states that in many areas of life, 80 percent of what happens can be attributed to 20 percent of the actors. It is also known as the 80/20 rule and was postulated by Vilfredo Pareto in the 19th century.
In logistics, the principle is used in ABC analysis and describes the frequently occurring situation in which 80 percent of the turnover is generated with 20 percent of the items (A items).

Source: logipedia / Fraunhofer IML