Is it in our best interest to cooperate or to compete? Is pursuing our self-interest the best way to get ahead, or are we more successful when we collaborate with others? In Friend Foe, two leading psychologists show the choice isn't quite that black and white. Drawing on examples from sport, politics, and the boardroom, Adam Galinsky and Maurice Schweitzer show that cooperation and competition aren't mutually exclusive u and that striking a balance between them can improve our long-term relationships, maximising success in work and life. In the process, they teach you when to raise your guard against colleagues, how to get your rivals to put trust in you, and why sometimes seeing things their way can help you get your way. This book is a guide for better navigating your social world, by learning when to cooperate as a friend and when to compete as a foe u and how to be better at both.