That the dramatic upheavals of war, pestilence and environmental collapse can trigger social disorder and revolution is well-established. Indeed, this dynamic can be viewed as the standard model of social disorder/revolution: a large-scale crisis—often a bolt-from-the-blue externality—upends the status quo.
Another model identifies warring elites and imperial meddling as a source of revolution: a new elite forcibly replaces the current elite (known colloquially as meet the new boss, same as the old boss) or a dominant nation-state/empire arranges a political coup to replace the current leadership with a more compliant elite.
A third model was described by David Hackett Fischer in The Great Wave: Price Revolutions and the Rhythm of History. By assembling price and wage data stretching back hundreds of years, Fischer found that cycles of economic growth spawn population growth, resulting in more workers entering the market economy. Their earnings trigger a demand-driven expansion of essential commodities such as grain and energy (wood, coal, oil, etc.).
In the initial phase, wages rise and commodity prices remain stable as supplies of essential goods expand and the demand for labor pushes up wages.
But this virtuous cycle reverses when the supply of essentials no longer keeps pace with rising population and demand: the price of essentials begin an inexorable rise even as an oversupply of labor drives down wages.
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