During WWII in the US, the economy was red-hot due to full employment of labor and real resources. To cool the economy & prevent inflation (too many dollars chasing too few goods) high federal taxes and an imposed rationing was used to reduce aggregate demand. Still, there were too many $s in the pockets of the citizens, so, appealing to individual patriotism, Treasury bonds were renamed "War Bonds" and sold to drain more $s from current use. Treasury instruments remove $s from the economy's use for a set period of time and pay a little interest at maturity. So, grandma didn't buy any bombers or bullets, but she did, voluntarily & unknowingly, put a lid on inflation.
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