I haven't seen that happen, maybe it does in some places.

In my hometown, we had a grocery, but it closed in the earl 90s. They didn't get another on until the lat 00s. It was open a few years, had bare shelves most of the time and convenience store level prices when they did have something. In the late 10s, a Dollar General opened... so far, it has remained open, has much better prices than the previous attempts, and is generally much better stocked. The town hasn't grown in that time. But Dollar General is existing where no one had managed to survive before.

We'll see how it goes long term.

Dollar stores are one of the primary drivers of food deserts. Info on this is a quick google search away, as there's a ton of research around this: https://anderson-review.ucla.edu/how-dollar-stores-contribut...