It Did Exist

Bull-fucking-shit. My maternal grandfather did this in the 1950s. It was incredibly common. He grew up a sharecropper in rural Georgia in the 1930s and early 1940s, so it was not like he was born with the proverbial silver spoon in his mouth. And he supported a family of four on a single salary while taking nice vacations, had multiple cars, and other luxuries. He did things that are impossible now for most people earning two salaries.

This is a retcon to get you to believe that there was never general prosperity (especially if you were white). When in fact, there very much was.