Hossein Karevan - Kermanshah University of Technology, Kermanshah, Iran
Mahvash Ranjbar - Kermanshah University of Medical Science, Kermanshah. Iran
Sahba Keshtmand - Industrial Engineering Student of Kermanshah University of Technology, Kermanshah, Iran

The Pareto Principle (also known as the 80-20 rule) states that for many sight, about 80% of theconsequences are produced by 20% of the causes. In this article we discuss the Pareto Principle andits importance in real life problems, describe some mathematical model related to it. We tested twosets of real life data to see if the Pareto principle applies to these aspects. For the Forbes list in2017,we found that 20% of the air line in that list own 45% of the sell. And 20% of the automobilecompany in that list 62% of the all automobile sell In both cases results have a really to the Paretoprinciple but not perfectly matched.

Pareto Principle, sale, automobile companies, airlines, Forbes