Two Income Families
Before WWII, most families in the U.S. included a working husband and a stay-at-home wife. "Keeping house" says the U.S. Census. So the average family existed on a single income. And exist they did.
But for those few years during the war, many women became involved heavily in the "war effort".
After the war, some of these apparently did not wish to go back to the somewhat sedentary existence of a housewife. They went to work! Now there were two incomes.
It seemed a valid argument in favor of women working -- that the family would be more materially prosperous, and as a result, they could live a better life.
In time, now that money was more abundant in two worker families, business men see a golden opportunity...
"People have more money. They can afford to pay more. RAISE PRICES!"
Image Credit » PD Wikimedia https://en.wikipedia.org/wiki/Rosie_the_Riveter#/media/File:We_Can_Do_It!.jpg