Although opportunity cost is definitely important, it is hard to put a "price" on the opportunity in many cases, which makes it unmeasurable. This is why economists focus almost exclusively on price.
<span>Society became more complex and interdependent.</span>
The correct answer to this open question is the following.
Although there are no options attached or any other context and references, we can comment on the following.
The government had to produce goods to ensure supplies for the armed forces.
During the times of World War and World War II, the United States had to modify what had been produced by the US industries in order to support the troops at the war front.
For instance, before entering World War II, the US lend-lease program of 1939 helped the Allies in that it gave them war supplies.
The US federal government approved the Lend-Lease Act of 1939 in order to support countries such as France and Great Britain in the war effort. The argument to lend and lease to these countries was that their role was important to keep the United States' economic and political interests safe.
Conditions changed and after Japan's Pearl Harbor attack in December 1941, President Roosevelt asked Congress for a declaration of war against Germany. That is how the US entered World War II.
The Allied victory in North Africa destroyed or neutralized nearly 900,000 German and Italian troops, opened a second front against the Axis, permitted the invasion of Sicily and the Italian mainland in the summer of 1943, and removed the Axis threat to the oilfields of the Middle East and to British supply lines to ...
