Ever since before Adam Smith, this model of countries not being able to produce everything that they require, but instead, focusing on a few things, and trading for the rest, has been accepted as a more efficient system, where everybody benefits from the savings these efficiencies allow. I think this model works extremely well ... until it doesn't. Until some event keeps trade from occurring, whether that event is a…
As to war, what is the probability of the countries actively tied up trade with each other going to war. Obviously the US and China are posturing all the time, but war?
Plus trade and countries are dynamic and flexible and changing all the time even without major external shocks. A sudden reduction in supply in location X, would shortly lead to a rise in supply from location Y.