Humans dominate the planet not through intelligence. They dominate through cooperation. A single human is weaker than a chimpanzee. But a thousand humans acting in coordination build pyramids. This book explores why Homo sapiens is the only species that cooperates in massive groups with strangers.The key lies in shared fictions. Money is fiction. Nations are fiction. Laws are fiction. But when millions believe in the same fiction, it becomes more powerful than any physical reality. A dollar bill is worthless paper until everyone believes it has value.We analyze how trust scales. Why small...