Earlier quoted context omitted.
Your math is off - for TCO you should be counting financing costs, not the payment itself. You don't really get away from financing costs by buying cash, incidentally: then they become the opportunity cost of not having the cash invested. I think people wildly overestimate how much you can save by driving a used car. Used cars are frequently overpriced due to demand for lower up-front costs and lower payments. Edmund…
The cashflow differences between buying an $8K car for cash and a $40K car with 20% down are the entire monthly payment [plus the required collision insurance], not just the interest charge portion. I'd wager that poor people are generally running their lives on a cashflow basis, not on an accrual basis. When I was a near-broke college student, that's how I thought. With regard to the savings of paying cash being off…
Now you're comparing a $40K new car to a $8K used car, which is not a reasonable comparison. Yes, used cars will save you some money, but they will generally cost you more money than driving a new Corolla or Civic. Poke around on Edmunds' TCO calculator. The problem with your argument is that you can save more and more money by imagining buying an even more expensive car to compare to. I mean, you could have bought an $80K car with 10% down, right? Now you saved $72K!!!