There was also a lot of consumer capital available due to the high savings rate in WWII (all those war bonds), there was tremendous optimism in the U.S. due to the vctory in WWII, the baby boom was underway and the population was very young and starting households, which meant they were buying houses and consumer goods like mad.
Health care costs were low because A) a lot of expensive treatments we have today didn’t exist, and B) the population was young and healthy. Today if you have cancer, you’ll go through a host of expensive treatments. If your kidneys fail, you’ll spend a long time on expensive dialysis. IN 1950, if that happened the ‘treatment’ consisted of a doctor telling you to go home and die. Today, if an old person’s knee wears out, they’ll get expensive joint replacement surgery. In 1950, they’d get a cane.
During this period, government regulations on business were much lower. This was before the Kefauver amendments to the Pure Food and Drug Act, the Americans with Disabilities Act, all the ‘Great Society’ regulations, and myriad other regulatory burdens that have been put in front of business since then.
The economy was less mature then, meaning there was more low-hanging fruit to be had in terms of efficiency gains. Developing economies always grow faster because of this. The 1950’s saw the start of a technological boom in electronics, business processes, energy infrastructure, transportation, and other components of a modern 1st world economy. At the start of WWI for example, air travel was still a slow, noisy, dangerous affair that was available only to the rich. By the end of the 1950’s, modern jet airliners were available.
WWII had all kinds of rationing, which caused pent-up consumer demand. When the rationing ended, consumer demand spiked.
Don’t underestimate the value of Keynes’ ‘animal spirits’. The U.S. population was optimistic, there was a ‘can-do’ spirit, people worked their butts off, and American exceptionalism was the rule of the day.
People who quote the 91% tax bracket as proof that high taxes don’t hurt economic growth are cherry-picking a single number and ignoring the other vast differences between the economy then and the economy today. But the fact is, even then the high tax brackets were seen as an impediment to growth. When Kennedy lowered the top rate from 90% to 70%, real tax revenue went up 33% in inflation and population adjusted terms over the next five years. Clearly the high rates were not just a drag on the economy, but had gone past the point of diminishing returns and were actually resulting in less revenue because of excessive tax avoidance or the growth-limiting effects of the high rates.
Of course, we can ask the same kind of question in reverse. Let me ask you: If big government is such a good idea, how come the 50’s saw such a boom when total government spending in the U.S. was only 21% of GDP - less than half of what it is today? If deficit spending boosts an economy through Keynesian stimulus, how come the economy didn’t collapse after WWII when government spending dropped from 53% of GDP down to 21%? How could an economic boom even be possible when so much government spending was stopped so suddenly?