I think the fundamental thing you're overlooking is Amazon's wide selection. There's a long tail of relatively low-demand items that a company like Walmart woul

I think the fundamental thing you're overlooking is Amazon's wide selection. There's a long tail of relatively low-demand items that a company like Walmart would just remove from their shelves. Looking over my recent Amazon orders, I'd guess that around half of it is made up of this sort of item.