I think the world pen­du­lum swings in twen­ty year cycles. Reces­sions occur every twen­ty years or so, We seem to go through a ten year con­ser­v­a­tive phase and then a ten year lib­er­al phase cycle. Schools of thought seem to flex the pen­du­lum a bit more and last a bit longer, but they also fit the pen­du­lum swing. New­ton’s Third Law even holds true for cul­ture. Until the heat death of the uni­verse. Any­way.
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