Comment by lossyalgo

You may be assuming a car-centric approach to shopping, where the distance between stores is large. In cities where shops are mixed into residential areas, people often walk because stores are usually within about 10 minutes, and there are multiple options with different selections and prices.

That makes it easy to rotate: stop by one store one day, another the next, often on the way home from work since you’re taking the subway or bus anyway. For example, I buy most of my groceries at one store, and then pick up certain items in bulk at other stores every 1-3 months when they carry the brand I want at a good price (unless my usual store has a sale). Most people I know do something similar, especially as groceries have gotten more expensive, particularly since COVID.