Everything we do and every choice we make has an opportunity cost. In a world of scarce time and resources each choice necessarily means rejecting many other possible opportunities. One of the best illustrations of this concept was made by President Eisenhower in a 1953 speech. Eisenhower criticized the use of scarce resources for military purposes because of the opportunity cost:
The cost of one modern heavy bomber is this: A modern brick school in more than 30 cities. It is two electric power plants, each serving a town of 60,000 population. It is two fine, fully equipped hospitals. It is some fifty miles of concrete pavement. We pay for a single fighter with a half-million bushels of wheat. We pay for a single destroyer with new homes that could have housed more than 8,000 people. [The Chance For Peace]
These kinds of choices are just as difficult as they were for Eisenhower in 1953. How much time, resources, and effort should be dedicated to military activities? It’s still a contentious argument, and opinions greatly differ.