Nothing stops Wal-Mart from putting Sam's Choice product on the endcap to the soft drink asile. Amazon has scale problem, and the question shouldn't be about pr

Nothing stops Wal-Mart from putting Sam's Choice product on the endcap to the soft drink asile. Amazon has scale problem, and the question shouldn't be about product x or product y, but why aren't there more Amazons and more Googles competing with each other.