[wing-_-nuts]

>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

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.

[Supermancho]

The online ordering is not tied into the realtime supplychain. The inventory mgmt that walmart developed is now ubiquitous among the largest retailers. Walmart is mow on or behind the innovation curve.