I was a very early Amazon customer in the beginning. I bought used,rare and new books, for genealogy.
Next I bought used and new books for historical fiction.
Small neighborhood book stores got marketing & systems from Amazon, that they could not afford on their own.
Two large used book stores, closed. Fewer New book stores.
Most of us drove to Video stores, then DVD rentals, next DVD mail from Netflix, next streaming from Netflix and Amazon.
Neighborhood DVD store, closed. Blockbuster closed.
I listen to Amazon music on my smartphone.
In my town, Kohl's and UPS are both Amazon-Return shipment drop points.
I wonder if Sears looked into partnering with Amazon, or did not?
One bet is sure: Amazon has lobbyists, working hard to keep their options alive. Banking, Real Estate, Vehicles, public utilities, energy are just a few segments they are probably considering.
Like banking and oil were once broken up, I think vertical and horizontal integration and monopolies should be scrutinized.