Earlier quoted context omitted.
Ever compare a 1940s middle-class house to a middle-class house of today? They're tiny. They probably have one bathroom. The bedrooms will be small. The garage, if there is one, is probably not attached to the house. The household probably had one car. Maybe had a phone, maybe not. Such a lifestyle could still be afforded buy a single income earner if they would really live the way a 1940s family lived.
I dont get the desire for huge houses - finding a nice 1500sqft home is hard - yes the extra space is great, but I gotta heat and cool that space. Beyond that - in 1948, radio was something everyone hard, Television was a luxury, a home phone was pretty universal, owning a car less so, even electric coffee pots were seen less often - no smart phones, tablets or home computers - though many had a typewriter. People wr…
Now I can replace all of that with a single device and single monthly bill - a device I need to have professionally anyways to participate in most of the economy.
My slightly younger millenial friends probably have monthly recurring expenses not a whole lot more % of income wise than the 1940's. They pay for a cellular data package and have a relatively modern phone, and that's about it. A 52" flat-screen TV is less than the cost of a radio in the 1940's today - it's just not relevant.