was proposed 30 years ago. Although it was successively refined by other theorists... the theoretical core, and especially the emphasis on intra-elit… - Peter Turchin

The theory represents complex human societies as systems with three main compartments (the general population, the elites, and the state) interacting with each other and with socio-political instability via a web of nonlinear feedbacks.

A group consisting entirely of self-regarding agents will never be able to cooperate. So cooperation is possible only if some agents are motivated by ‘extra-rational’ prosocial norms, including the norm of moralistic punishment.

You have to think dynamically... I'm talking as a scientist about entering into a crisis, and then... societies have to somehow get out of it, so in Douglass North and his colleagues, for example, they look specifically at the Glorious Revolution... the exit from about 60 years of conflict, which started... in Scottish Wars 1639 and... ended in 1690s with the new arrangements. So... when societies exit from these crises... Sometimes, by the way, they don't exit, they essentially have political fragmentation. ...Think about the Roman Empire, which has fragmented, and there was no new Roman Empire. But frequently we do have reconstitution, ...England, for example, reconstituted itself. So think about it dynamically. You have to look at the path of the crisis, and then the path out of the crisis.