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It's not so much the percentage on produced defense goods, but how quickly could a society ramp up production of goods, services, and people to defend itself compared to the militaries of its potential aggressors.

In particular, most of the effort should go to the innovation side of war materiel. The innovation of the atomic bomb is a particularly nice example in that as a result of conceptualizing and then executing on it it allowed the US to win the war in the Pacific and hasten the end of war in Europe. Even if we otherwise had massive stockpiles of people or other weapons, our enemies could potentially have equaled them and dragged the war on interminably. It was the unknown unknown via innovation that unseated Japan and could potentially do the same to us based on innovation coming out of almost any country in the modern age.

ubiquity - n.

the state or capacity of being everywhere, especially at the same time

aggression is everywhere and its just something that comes with living in a city?