Im not convinced thats true in all or even most cases
It's very easy to see when you live it yourself.
It's also more expensive to buy small quantities of many products than it is to buy in bulk and store the excess until it's used. It's yet another way our society punishes the poor.
Public transit is just great overall, being able to walk to get basic day-to-day needs is pretty sweet as well. I seriously do not understand this argument, and I've lived in Brazil, USA, and Sweden, it's simply a non-issue when mass transit is dependable, well-connected, and available.