I wonder how much overhead you can lose when you don't have to have a cashier in a grocery store. I've thought about a grocery store that essentially doesn't ha

I wonder how much overhead you can lose when you don't have to have a cashier in a grocery store. I've thought about a grocery store that essentially doesn't have a warehouse section but instead is just a combined warehouse/store. I'm sure this already exists and I wonder how you handle the large pieces of machinery that you need to move the goods among regular shoppers?