Why do human beings fight one another? In this exhilarating and bracing book, we learn the common logic driving vainglorious monarchs, dictators, mobs, pilots, football hooligans, ancient peoples and fanatics. Distilling decades of economics, political science, psychology and real-world interventions, and through his time studying Columbia, Chicago, Liberia and Northern Ireland, Christopher Blattman lifts the lid on the underlying forces governing war and peace. Why did Russia attack Ukraine? Will China invade Taiwan and launch WWIII? And what can any of us do about it? 'Captivating and intelligent' Tim Harford 'Wise, intriguing, imaginative' Rory Stewart 'Nothing could be more relevant today than war and peace . . . an outstanding and original book on this topic' Martin Wolf, Financial Times 'Important, readable, radical' David Miliband 'A great storyteller with important insights for us all' Richard Thaler, co-author of Nudge 'Essential for understanding the world we live in today' James A. Robinson, co-author of Why Nations Fail

An acclaimed expert on violence and seasoned peacebuilder explains the five reasons why conflict (rarely) blooms into war, and how to interrupt that deadly process. It's easy to overlook the underlying strategic forces of war, to see it solely as a series of errors, accidents, and emotions gone awry. It's also easy to forget that war shouldn't happen-and most of the time it doesn't. Around the world there are millions of hostile rivalries, yet only a tiny fraction erupt into violence. Too many accounts of conflict forget this. With a counterintuitive approach, Blattman reminds us that most rivals loathe one another in peace. That's because war is too costly to fight. Enemies almost always find it better to split the pie than spoil it or struggle over thin slices. So, in those rare instances when fighting ensues, we should ask: what kept rivals from compromise? Why We Fight draws on decades of economics, political science, psychology, and real-world interventions to lay out the root causes and remedies for war, showing that violence is not the norm; that there are only five reasons why conflict wins over compromise; and how peacemakers turn the tides through tinkering, not transformation. From warring states to street gangs, ethnic groups and religious sects to political factions, there are common dynamics to heed and lessons to learn. Along the way, we meet vainglorious European monarchs, African dictators, Indian mobs, Nazi pilots, British football hooligans, ancient Greeks, and fanatical Americans. What of remedies that shift incentives away from violence and get parties back to deal-making? Societies are surprisingly good at interrupting and ending violence when they want to-even the gangs of Medellin, Columbia do it. Realistic and optimistic, this is book that lends new meaning to the old adage, "Give peace a chance."