Opportunity cost is what you give up when you choose one thing over another. When the government spends money on war, that same money cannot be spent on roads, schools, healthcare, or research. The cost is not just what you paid—it is also what you did not build.
This matters because public dollars are limited. Every budget choice involves trade-offs. Money spent on regime-change wars was money not available for domestic needs.
The sections above documented direct war spending ($2.9 trillion through 2022) and long-term obligations ($12.7+ trillion through 2050). This section shows what those dollars could have purchased instead.
These comparisons use documented costs for actual public programs and infrastructure projects. The numbers show the scale of foregone investment.