I would be interested to see any data on how much the 1-2 day delivery promise drives customer purchases from Amazon? Personally, the thing that matters much mo

I would be interested to see any data on how much the 1-2 day delivery promise drives customer purchases from Amazon? Personally, the thing that matters much more is the breadth of the offering. I would buy much more from Costco if they carried the stuff that I want. It would not matter to me if it took a day or two (or three) longer to get it as I don't really buy stuff that I need right now online.