Italian economist Vilfredo Pareto was studying population and land ownership statistics in 1896 when he came up with the 80/20 rule aka the Pareto principle.
One hundred and one years later, British writer Richard Koch published The 80/20 Principle. The book was a reinterpretation of the Pareto principle and extended the idea that the top 20% in any group is likely to produce 80% of the results.
The book, which has sold more than a million copies and been translated into 35 languages, has been called one of the most important business tomes ever written. For anyone whose job it is to analyze sales results – The 80/20 Principle is a must-read!