A new Model T in 1925 cost had fallen to 260$, that’s roughly $4,348 in todays money. Sure it’s missing a great deal of modern features, but it’s hard to get a new golf cart at that price.
People can afford much nicer cars now. Regulations also require decent crash safety. There's not much of a market for these kinds of super-cheap cars.
Though it'd be interesting to work out how much an exact clone of the Model T would cost today (mass produced using modern technology).
The model T was pretty simple, and you can buy engines with waaaay more power - and longer life, quieter, more efficient, etc. too for sub $500 at harbor freight and strap it to a frame, and off you go.
Assuming we’re talking ‘functional equivalent’, compared to ‘exact copy’.
Aside from that, there's the fact that if you can actually afford it, then it's likely better to finance than to pay cash because you can invest the full purchase price of the car for a higher return than the interest you would pay.
Anyway, that’s an unexpected 500$ expense. My point was people financing a 50+k new car could fairly easily buy a 17,600 car out of pocket by waiting a little longer before purchase. Large scale changes in purchasing habits would have significant knock on effects for the used car market, but that’s another story.
Holding off on a X$/month car payment on a 50k car can very quickly turn into a new 18k car. Continuing to put away that same car payment and you’re able to buy a 50k car out of pocket quite soon. Essentially financing doesn’t make expensive cars more affordable it simply allows people to buy them sooner.