In the distant past, wars were for territorial gain for resources. They still play a big role in the politics of war. Yet you have a religion that has declared jihad, holy war against all who do not submit to their way of believing, and desire an eventual worldwide caliphate. Then there are communists who wish for worldwide communism or socialism at least. Others, too, who would like to see worldwide democracy. But the big money is the international corporations who support politicians and others in political power for their own profit. So money is a big factor, and is roughly equivalent to resources in some ways, power in other ways.
Inflation is roughly caused by increasing amounts of people and dwindling resources. So not spending money can lead to the saved money being able to buy less than a year ago, unless it is invested in something that is increasing in value significantly faster than inflation. Investing can be risky, unless you are very rich with money invested in numerous areas.
In the distant past, wars were part of the natural way of selection and predation to keep the species improving and population below maximum sustainable. If a war could be that way now, it would benefit the species. However, wars have become negatively selective and not nearly big enough to make up for other lost predation like diseases and wild animal attacks, or starvation from an area drought or other calamity. People have not changed, for the most part, and have separated themselves from the natural world, so human numbers have been allowed to overshoot many times the level a wise species would have kept.
It is at a point where you may as well keep a good savings, but spend enough to have good alternative green power, plenty of supplies and means to protect them. It is most likely this inter-dependent global ecological niche will collapse region by region, probably at or before mid-century, depending on where you are.
Sure, there could be a disease like the 1918 flu epidemic, or a war worse than WWII, and the fertility rate is dropping. It is just that those things probably won't be big enough to stop collapse, or the far reaching effects of AGW and depletion of aquifers and soils.
To me, it seems foolhardy to fight for fossil fuels which should not be burned. It is also foolhardy to try to conquer through out-breeding those you wish to conquer, seeing humanity itself is in a state of catastrophic overshoot in population already.
The quicker population crashes to around a half billion, the more resources that will be left for the future and the less depletion and pollution effects. It is horrible, but "the bomb" could be the answer, to a wiser species. Everything that would lower population and emissions fast enough, is almost as horrible as the die-off itself. The people that do want to play God are not nearly wise enough, and those wise enough do not have the power, or inclination. So God's Laws of Nature will take their course in species die-off, probable CAGW after, with global ELE completion. A bottleneck, geologically, of probably at least 200K years. The chances for the human species making it that far are less than 1% IMHO.
Oh, for humanity to go back 11K years and have another chance, or even 50 years. Could knowing the future make it so we could change it, given enough time again? I knew 45 years ago and haven't been able to do much to stop the Juggernaut. 30K people in NPG have been unable to do much. Unlike Fosgate, I keep trying to stop the unstoppable beast. I will never give up, for the love of future kids and their chance to live, which is God's Will for me, among other things.
"With every decision, think seven generations ahead of the consequences of your actions" Ute rule of life.
“We do not inherit the earth from our ancestors; we borrow it from our children”
― Chief Seattle