Who do you tip at the grocery store? Those products don't just materialize on store shelves. Who do you tip at the self-service gas station? The gas doesn't ju

Who do you tip at the grocery store? Those products don't just materialize on store shelves. Who do you tip at the self-service gas station? The gas doesn't just get to the pump by itself. Who you tip when you buy something from Amazon? The product doesn't get to and from the warehouse by itself.