Venzuela is a great example of my point! If V got into a war right now, let's say with Columbia, how would that go? If the money is worthless in V, then how do you pay troops; how do you pay for the food for the troops; how do you pay for the gas to get the troops where they need to be; how do you pay for the weapons? If you don't pay for that stuff, how do you get it? Will people volunteer? How long can they do that until they starve? Or will you use coercion? Coercion requires troops, and also suffers from the starvation end-game, at both ends.

Basically, V can't fight a war until they get their money situation in order.