From the OP:
>But for both Jet and Wal-Mart, Amazon’s frenzy of warehouse construction and fast delivery—as quickly as one-hour—have proved formidable. The retailer has logged three straight quarters of record profit while locking in an estimated 60 million members to its $99-per-year Prime service, cultivating a loyal customer base and giving consumers fewer reasons to shop at traditional stores.
The answer is not buying a unicorn startup with seemingly no fundamental advantage over Amazon. If I were Wal-Mart, I would take the $3B and try to build a great technology organization and/or fund Wal-Mart Labs more. So much of what makes Amazon better is the data accrued over the last 18 years and the insight mined from them by their super-talented team.
And Jet.com is definitely not going to give that to Wal-Mart overnight. If I were them, I'd focus on long-term viability, not a short-term hack to placate shareholders.