[wfleming]

I can think of multiple “corner stores” that are the only business within a single-family home residential area within a few minutes drive of the house I grew up in in suburban NY. I’m pretty sure they all got grandfathered in and would not be permitted as new construction with the zoning, but they’ve all been in business since before I was born and are still going. These are mostly neighborhoods without sidewalks, and the stores have parking for only a handful of cars.

You’re right that “most” houses can’t be within walking distance of a corner store outside cities, but my anecdata experience is those residential communities can definitely support those businesses. They might require a short drive, but they’re still a lot closer than the shopping center, and a mix of “ran out of one thing”, deli/breakfast sandwiches, and beer keeps them in business.

[bluGill]

I suspect many of them are grandfathered in economically too - they are not generating enough income to support starting a new one, but the family has had it for years and never ran the numbers to see just how badly they are doing. (or maybe they only work so long as the equipment doesn't break)