I remember reading articles 10-15 years ago about how the minute someone scanned an item at the cash register, Walmart's inventory systems, which knew what product was on what shelf and in what quantity, would automatically order refills from the supplier.
They have always been highly innovative and tech savvy when it comes to the supply chain, at least for physical retail.
I wish this were the case, but anyone thats tried to do online grocery shopping at walmart knows that a lot of stuff shows out of stock, but is actually there in real life.
Forgot about that and Walmart is an easy target for a lot of things :)
Innovation in process engineering and operations isn't really discussed much here, but it's almost assuredly had a much greater impact on keeping inflation at bay (helping the median American's salary stretch a little farther) than anything Amazon has ever done.