This doesn't address the claim oblio was making - 'People are poorer than they were in 1990, especially the mid to lower classes' - real GDP per capita could double but it all be captured by the top quartile, for example.
(I think the claim is still wrong, and that all quartiles are doing better in real terms, but that's a tougher thing to measure)
Annual wages are about 15% higher today compared to 1971 in real terms. Real terms is a bit suspect in this case as wage earners are more likely to pay nominal rent then owner equivalent rent. It may well be accurate that the average wage earner is worse off today then they were in 1971.
I'd venture a speculation that this is reflected in media, sitcoms of the 70s rarely had roommates - and the 80s/90s poked fun of those who lived in their parents basements. Roommates are relatively common in shows today.
Shared living arrangements have been prevalent long before the 70s, boarding houses and the like. I wouldn't rely on film and television industry to be exactly that representative of the times.
Well forget that facile analysis and go back to your parents generation. They afforded houses, current generation cannot afford houses. It’s obvious that the current generation got gypped.
The 15% increase in wages is in real terms, meaning it's already been adjusted with inflation. Think of it this way: in nominal terms, wage increase would be 715%.
(I think the claim is still wrong, and that all quartiles are doing better in real terms, but that's a tougher thing to measure)