How the 80/20 Rule Can Radically Change the Way You Work By BoostBC In The 4-Hour Workweek, Tim Ferriss emphasizes a simple but powerful principle: the 80/20 rule, also known as the Pareto Principle. It states that 80% of results come from 20% of efforts. While this idea isn’t new, Ferriss applies it in a way that challenges how we think about productivity, work, and success.