There is an important intermediate grocery buying process that is heavily used by the not so wealthy.
That is going on line at Walmart and putting what you need into a shopping cart and then picking it up outside. This seems to be very popular.
Walmart maintains a list of your purchases so you can easily reorder common stuff. For women who work, they can do most or all of their weekly grocery shopping on line at Walmart while at work.
When my wife was sick and couldn’t get out, she did the shopping on line. I went to pick it all up. You go to one of the spaces call the given number and then the groceries are delivered to your car.
Does Walmart charge for this pickup service? I figure they almost have to, considering how many employees are filling up carts for the shoppers who pick up.