You got it backwards, there wouldn't be a walmart outside of town if there were no cars, you'd walk to the local butcher/baker/whatever in <10min.
And you pay small local stores with higher prices - which leads to more people, even in such small-towns with local butchers and bakers to get into their ride and go to the Lidl or Aldi on the outskirts.
Much like companies will realise LLM-using devs are more efficient by some random metric (do I hear: Story points and feature counts?), and will require LLM use from their employees.
Economies of scale do mean you can get a fluffy blanket imported from China at $5, less than the cost of a coffee at Starbucks, but for food necessities Walmart isn’t even that cheap or abundant compared to other chains.
When 75% of the west is overweight or obese, and when the leading causes of death are quite literally sloth and gluttony I think I'd take my chances... We're drown in insane quantity of low quality food and gadgets