In this ambitious work, Justin Jennings explores the origins, endurance, and elasticity of ideas about fairness and how these ideas have shaped the development of societies at critical moments over the last 20,000 years. He argues that humans have an innate expectation for fairness, a disposition that evolved during the Pleistocene era as a means of adapting to an unpredictable and often cruel climate. This deep-seated desire to do what felt right...