JWBooth already answered the question in another thread, btw...
Keynesians gonna keynes...
Yeah, there is that.
There is also the case of consumers wanting more and having more to chose from.
I grew up in the 1950-60s;
ONE TV in the household, B&W at first, later color.
TV reception was either an antennae on the roof or 'rabbit ears'.
Ten-key adding machine, no PC~Tablets.
One phone and one line, originally had been a party-line. No cells.
Autos had no safety belts, airbags, and just starting to change from clutches to automatics. Am radio only.
A tune-up was change spark plugs (or clean and re-gap), change points and condensor. Set timing with a strobe light.
Music was on vinyl, 45s, 33-1/3 LPs. Tape was reel to reel.
I worked in retail. - we had no bar-codes or scanners. We had cash registers with numbered buttons, mechanical calculator.
Wardrobes were limited in size, we didn't change over each season for fashion.
"tennis runners" were more like $20-$40 today's prices, not $200-$500.
Candy bars were 5 or 10 cents, not a dollar or two.
I could go on, but main point is life was simpler and had a lot less consumer goods to be considered basics, than compared with today, when there are several times the selections and "necessities".
Back then a good pair of long-lasting work boots would cost a days wages. Today it is about the same. Some things haven't changed, many other have greatly.