One of the technology leaders, a few years ago, was visiting with me here and we were writing on the whiteboard and they stopped and turned around and looked at me and said, "Oh my God, you're going to win." And I said, "Yeah, but why?". "Now, tell me how".

I think what we've seen happen so far is that as we've applied technology for the picking process in the store, for example, is that job composition has changed but we have about the same number of people.

There are all these things that add up into this business that's Walmart that keeps it really interesting. At the root of it all, though, it's a people business and it's a merchandising business. Today, it's increasingly a technology business. The supply chain is critical, of course, and real estate still plays a key role.

The stores are an asset, and they have a great assortment in them and they're close to people. Being within 10 miles of 90% of America is a huge advantage, especially with fresh food at a good price. But we must also, if you think long-term and you think about what the company wants to accomplish, you must have a big and important first-party e-commerce business, and you must have a marketplace, and the things that go along with the marketplace.

The sales floor probably gets more people. And what we're seeing in supply chain is that it's basically the same number of people with just a whole lot more productivity, but their jobs change.

Customers want to save money and time and have the broadest assortment of items, and we think that by bringing e-commerce and digital capabilities together with the stores, we can do things that a pure e-commerce player can't.