Free market capitalism is unique in the sense that its existence is dependent on the voluntary actions of free individuals. The use of force is absent in a free market, unlike other institutions of social and economic order like Socialism, Communism, or Fascism. The absence of force has lead free market capitalism to be the most productive and peaceful institution, creating the highest standard of living to ever exist.
However, this institution can be severely disrupted by the state intervening in the peaceful process of the market. The state forcefully takes from the market during times of war especially, this negatively impacts consumer good as private consumption decreases dramatically. In the recent past, many so-called conservative advocates of the free market have tried to support both the free market and preemptive war, two entirely incompatible ideas. The Just War Theory is the only plausible theory that correctly allows for the government to wage war in defense of its sovereignty.
We are often told that war is “good for the economy.” This myth could not be further from the truth. We are told that when government spends money on purchasing tanks, guns, and helicopters it creates jobs for thousands of Americans. That may be true; however we must remind ourselves every penny spent by the government has come directly from the private sector. The government helps one individual at the expense of another. Also, the tanks, guns, and helicopters the government purchases do not have any use outside of war. Therefore, they are not a consumer good that can be used in the future. Since the government funded these purchases with private sector money, the consumer has less to spend and production decreases dramatically.