There just aren't that many opportunities in the world that are that big, and for a company like Walmart that needs to move the needle in a big way, you have to take some big bets, but if you're going to take that much risk, the reward has to match up.

I think scale matters, and being an Aggregator creates lots of opportunity, but scale also has a lot of disadvantages and it's an imperfect concept.

By the time we got to 2020, we had leaders that had a stronger digital acumen, e-commerce set of capabilities and beliefs.

E-commerce had become so big and the plan was moving along such that you can't undo it now, you can make it better, you can plus it up, you can find some synergies and remove some of the older problems we had of the separation, but it created some newer problems and some complexity on how you actually integrate a supply chain, for example.

People were wondering, "How do you even do food e-commerce? Are we going to be dropping strawberries on somebody's doorstep? It doesn't feel like we're going to be doing that". But what we believed is that in the US pickup might work. So we started in California and then Denver, and a team started working to put everything in place to do grocery pickup and in the beginning we even had a separate app. It was an orange online grocery app.

It was always the plan to bring things together, but just like the structure, it needed to be separate for a while for good reasons. We couldn't pick at store level the full Supercenter for a while. It's a lot harder to receive an e-commerce order and pick a toy at Christmas on time than it is to pick the strawberries every day, because you know where they are.