It's called the 80/20 rule -- 80% of a result caused by 20% of its participants: https://en.wikipedia.org/wiki/Pareto_principle https://en.wikipedia.org/wiki/Pa

It's called the 80/20 rule -- 80% of a result caused by 20% of its participants: https://en.wikipedia.org/wiki/Pareto_principle https://en.wikipedia.org/wiki/Pareto_principle