Couple of hundred years?[2] Many models look sustainable[1] in the short term - few decades is short for any economic model to show its weaknesses. The soviet m

Couple of hundred years?[2] Many models look sustainable[1] in the short term - few decades is short for any economic model to show its weaknesses. The soviet model did survive for 5-6 decades years quite well after all. [1] Sustainable does not mean good or that I (or any else) condone it, just that it can work and survive . [2] That is the number to make it comparable to modern American Econo-political system that has survived largely intact in pretty much same form from the early years of the revolution. Historically feudal monarchies or other systems like the Tokugawa Shogunate had survived much longer for variety of reasons however that are difficult to compare in the modern techno Geo-political era .