You said
> If they're happy to do it to 1970s standards, probably most of them [could support a family on one income with an ordinary job].
Our house has the same electrical wiring that it did in 1969. The couple that sold us the house told us they bought it for $20k, which means a cashier could have afforded it back then, but now it's too expensive. Therefore, the fact that it has electricity has no bearing on whether it's prohibitively expensive for most people, and I can make a similar argument for any house built in the mid 20th century.
>Your mortgage is what, 20 years? $200 x 12 x 20 ~= $50,000, and around 25% of the mortgage principle. We've found 43% (almost a half house) of the cost so far in the electricity alone. Wiring it up and running the grid aren't cheap. I've always suspected it is illegal to build & sell a house without electricity otherwise there'd probably be a brisk market in them as a cheap option, the savings potential is there.
Practically all houses had electricity in the 70s. So this is already contradicting what you said earlier if you're citing electricity as the reason no one can afford a house on one income.
>It's 15%. That is a substantial chunk of the whole.
It doesn't matter if it's substantial. I'm only saying it's not so much that it's the reason no one can buy a house and support a family with an ordinary job.
Median income doesn't matter to my point. Housing prices have skyrocketed to the point that most people can't buy a house on one income. No one who's paying attention can deny this fact with a straight face, and your claim that it wouldn't be true if people lived by "1970s standards" is easily proven false by the fact that houses that were built in the 1970s with all the exact same amenities are still overpriced way beyond inflation.
The fact that a Victorian house that's falling apart to the point of being dangerous was listed ANYWHERE for $180,000 serves my point.