But if you want to extend the time horizon to 400 years (ie. to the beginning of the end of feudalism) that's still not that long in the grand scheme of things.
That said I don't really know if I buy that we're in that system anymore either; I think history books will probably eventually recognize a shift starting around the collapse of Breton Woods and that we're currently in a long and increasingly painful transitionary period that we're in denial about to something we can't yet describe.
But I Am Not An Economist (nor do I want to be one), so who knows.