The 4-Day Work Week Evidence: Iceland, UK, and Japan Trials Show Clear Benefits

Over 200 companies adopted 4-day work weeks globally. Iceland's trial: maintained or increased productivity. UK pilot: 56% more productive. Japan Microsoft: 40% productivity boost. The 100-80-100 model (100% pay, 80% time, 100% output) is gaining traction despite challenges in customer-facing and manufacturing roles.