Peter Turchin

A brilliant new theory of how society works from one of the most iconoclastic thinkers of our time. What leads to political turbulence and social breakdown? How do elites maintain their dominant position? And why do ruling classes sometimes suddenly lose their grip on power? For decades, complexity scientist Peter Turchin has been studying world history like no one else....

What was history's biggest empire? Or the tallest building of the ancient world? What was the average life expectancy in medieval Byzantium? The average wage in Old Kingdom Egypt? Where did scientific writing first emerge? What was the bloodiest ritual human sacrifice ever? We are used to thinking about history in terms of stories. Yet we understand our own world...

Many historical processes exhibit recurrent patterns of change. Century-long periods of population expansion come before long periods of stagnation and decline; the dynamics of prices mirror population oscillations; and states go through strong expansionist phases followed by periods of state failure, endemic sociopolitical instability, and territorial loss. Peter Turchin and Sergey Nefedov explore the dynamics and causal connections between such...