I see this that lets go to war means let us ulter the existence of certain economic progression. Apart from death of people both soldiers and the civilian, it take back the system backward from the party in the war but the effect is more on the people not in the fighting, the world at large. It is effect more on the world as it increase inflation and reduce the living of the people of the world if the countries have major contribution for the world economy.
The effect of war include rising inflation, extreme poverty, increasing food insecurity, deglobalization, and worsening environmental degradation. All the effect here are what we see in the Ukraine and Russia war, example is inflation that is affecting different country in their economy because products going out from Ukraine like wheat or corn leaving out there in small quantity and expensive. Russia is not supplying energy to Europe neighborhood and that slow access to production in the region there and causing life to be difficult.
Russia is a major supplier of fossil fuels, especially to Europe. Disruptions to supplies of these commodities are driving up prices.
The degradation of environment is also there if war happen and this is major effect on agricultural produce leading into the food shortage and insecurities around that.
There are many negative effect of war but no profit and
rebalancing fiscal priorities could prove quite challenging even in advanced economies. War is of course very detrimental to civil society. Crisis in food, drink, and crisis in health. If we look at the war in Ukraine, there are still places left for civilians to take refuge because it has a large territory. However, if we look at the war in Palestine, it is truly sad, there is no safe place for civilians. Even refugee camps were targeted by the Zionists. This is something bad happening in Palestine, and we don't want it to happen in other regions. Because no matter what the conditions of war, the victims are civilians. Of course, the impact of war can cause crises in neighboring countries. Apart from that, stopping the supply of food and fuel can cause an economic crisis. This is because the prices of all basic commodities in the country are high.