Right now, Wal-Mart is the nations #1 food supplier.
Wal-Mart’s Advantage in the Fight Against Amazon
Half of Wal-Mart’s stores are in rural areas, where fast shipping and grocery delivery are expensive to operate.
What are Amazon Advantages over WalMart?
Walmart, Google Join Forces In Online Fight Against Amazon
http://www.npr.org/sections/thetwo-way/2017/08/23/545482081/walmart-google-join-forces-in-online-fight-against-amazon