I don't think that people in this thread appreciate how prevalent grocery shopping in dollar stores is. In the US, half of shoppers buy groceries from a dollar store. They do it because it's literally all they can afford anything else. There are more dollar stores than Walmart, Starbucks and McDonald’s combined. "Kyle Dishman can’t afford to shop at the local grocery store anymore. Instead he goes to Dollar General,…
I think you are misreading the (ambiguous) mashed.com text, "More than half of shoppers now visit dollar stores to buy groceries, eMarketer reports, up from 21 percent just a few years ago.". It does not mean that more than half of all grocery shoppers buy their groceries at dollar stores, but that more than half of dollar store shoppers are shopping at the dollar store to buy groceries.
Actual market share of dollar stores in the grocery business is 2.9%, but this is expected to increase to 3.2%
https://www.supermarketnews.com/issues-trends/will-supermark...