The Pareto principle (also known as the 80–20 rule, the law of the vital few, and the principle of factor sparsity) states that, for many events, roughly 80% of the effects come from 20% of the causes

“Ethan was a change agent at ZipRecruiter. He played a key role in the growth of the company from a 15 person lifestyle business to 250 person market leader. When Ethan told me he wanted to leave to start a consulting business, my only condition was that ZipRecruiter be his first customer. “