I can't recall which episode (maybe the one you linked but there are others) but one NPR Planet Money had a local shop owner complaining that Dollar General eve

I can't recall which episode (maybe the one you linked but there are others) but one NPR Planet Money had a local shop owner complaining that Dollar General even stocks SKUs unavailable for sale to other stores due to purchase agreements, such as intermediate sizes of canned food at a more attractive price point.