Transylvania Lectures with Complexity Scientist Peter Turchin: Can the Collapse of Societies Be Foreseen Through Scientific Methods?

Turchin sought to answer the question of why great societies and empires rise and then collapse again and again. He presented the structural-demographic theory, which describes several interlinked crisis mechanisms.

The first is popular immiseration, when living standards of the population decline persistently and social tensions rise. The second is elite overproduction: too many people strive for influential positions, but only a few can obtain them. Frustrated, unsuccessful elite groups can easily turn into counter-elites, working to destabilize the existing order. The third crisis mechanism is state fragility, when institutions fail to fulfill their basic functions, such as maintaining public security or defending borders. When these three processes reinforce one another, societies enter a crisis period—historically often taking the form of civil wars, revolutions, and the collapse of order.

Processing 10,000 Years of Data

Turchin explained that while history offers many narratives, with the help of the global historical database Seshat, systemic patterns can be identified. The database brings together quantitative data on societies from the past 10,000 years, enabling researchers to test theories of why societies rise and fall.

What do we find when analyzing the data? Recurring cycles: societies grow, become wealthier and more complex, but in parallel, inequality increases, elite groups multiply, and the state weakens. This leads to crises and collapse. After the chaos, a new order emerges—then the cycle begins anew.

The professor stressed that these mechanisms repeat across historical cycles, from the Roman Empire to medieval England to the modern era. In his view, these warning signs are increasingly evident in today’s Western societies. He cited the United States, where inequality has risen dramatically in recent decades, the number of university-educated elites far exceeds the positions available, and these trends combine with the state’s fiscal difficulties. Together, they suggest the U.S. has entered a turbulent period—already visible in recent polarization and unrest. He summarized these findings in his book End Times: Elites, Counter-Elites, and the Path of Political Disintegration (2023).

Recognizing the Patterns May Help Avoid Collapse

The lecturer emphasized, however, that crisis is not inevitable. Timely reforms can ease tensions: reducing social inequality, aligning elite education and training with labor market needs, and strengthening state institutions and finances all contribute to maintaining stability.

Although this may sound simple when summarized, in practice it is difficult to achieve. Historically, most societies failed to implement reforms in time, and only after severe crises did new institutions emerge. Yet there are examples of success: in the early 20th century, the United States, through progressive reforms, managed to stabilize itself for a long period. This shows that decline is not inevitable—if warning signs are recognized in time. But this requires determined leadership, political will, and above all the recognition that problems are structural, not just the faults of individual leaders.

An Interdisciplinary Approach to Analyzing History

Peter Turchin also demonstrated how such models are built: they use mathematical equations describing population growth, measure changes in inequality, analyze competition among elite groups, and assess methods of collecting state revenues. These models are then tested against historical event data, forming the basis for forecasts.

He emphasized that this is not like a weather forecast where one can predict tomorrow’s temperature. Social systems are far too complex for that level of precision—but trends and risks can indeed be identified. The key value of cliodynamics, he stressed, is not that it predicts a definite outcome, but that it helps societies recognize accumulated structural pressures and provides the opportunity to act before it is too late.

In the Q&A session, questions from the audience raised issues specific to smaller states, the role of religion, and the impact of technology. According to Turchin, religion has sometimes functioned as a cohesive force, at other times as a divisive factor; for smaller states, external influences can be just as decisive as internal fault lines. Technology may accelerate processes—such as through social media—but it does not change the fundamental mechanisms.

In closing, the professor emphasized that the goal of his research is not to paint a pessimistic vision of the future, but to provide a warning. By combining history, mathematics, and data, we can begin to understand why societies rise and fall, and how to avoid the worst outcomes of these processes in the future.

The discussion was moderated by Örs Magor Köllő, software engineer and MCC alumnus.