This is what I did in... Ages of Discord, I looked at more than 200 years of American history... an aggregated measure of well being... the blue curv… - Peter Turchin

was proposed 30 years ago. Although it was successively refined by other theorists... the theoretical core, and especially the emphasis on intra-elite competition and conflict as the most important driver of socio-political instability and state breakdown, remained constant. Over the past three decades, the theory was empirically tested by a growing number of researchers. Currently, there are detailed investigations of at least twenty crises... to test the predictions of the theory... [T]here are several dozen other less detailed examples. The... verdict is that.. predictions are well supported by data. ...[R]ival theories are not supported.

[U]ntil the fundamental SD drivers for instability are reversed, there will be other triggering events... social turbulence may continue for years ahead.

Look at a more traditional society in which the elites are... landed nobility. ...[T]he way the wealth pump operates there is that when elite overproduction occurs... Nobles basically oppress peasants and turn on the wealth pump. So instead of economic mechanisms that transfer wealth from commoners to the Elites, in this case you have more coercion methods. ...So this is a variation on the theme ...