It seems like in the cut throat world of retail; Amazon is killing it. I can't help but think it has almost everything to do with their free two-day shipping. If this is the case, why hasn't a giant like Walmart (or Jet), Target, or other company embraced free 1-day shipping?
I know the obvious answer would be 'it costs too much'. If that's the case why don't they try to Amazon it? (Amazon it - Have a great idea, lose a ton of cash, gain traction, figure out how to monetize it.)
So, yes, "it costs too much" is the obvious answer, but it is true. Unless the recipient is in the same "zone" as the shipper, the cost of next-day air shipping is likely still anywhere between $20 and $50 (dependent on many factors), which is heavily discounted from retail rates. That would cut into margins quite a bit.