The only valid purpose of a business is to create a customer. Work expands to fill the time available for its completion. Never invest in something you don't understand. Every successful manager knows that there are immutable laws that impact almost every aspect of management. This slim volume collects together the twenty essential rules that every manager must be aware of. From Kautilya, Confucius and Darwin to Parkinson, Deming, Buffett, Grove and Drucker, these are timeless pronouncements on the art of management from thought leaders across the ages. Along the way, the author also provides a number of interesting points to ponder on: Why do we continue to use the QWERTY keyboard even though we know it's not the most user-friendly? How does the Tata Group follow Confucius's Golden Rule? The optimal number of direct reportees for an efficient manager is only four—how many do you have? This book is essential reading for you if you want to be at the top of your game as a manager.