Without density you can't have these in a walkable neighborhood. It takes X number of customers to support a grocery store (or a bodega, or a restaurant, etc).

Without density you can't have these in a walkable neighborhood. It takes X number of customers to support a grocery store (or a bodega, or a restaurant, etc). If you want one nearby, you need more people in a smaller geographic area. Besides, it is not one or the other. Ground level retail, upper level residential, and you get both.