The long history of Amazon and Walmart’s battle to be the behemoth of retail

Amazon and Walmart. Walmart and Amazon. Separately and together, for better or worse, these megaretailers have transformed how Americans transact. It’s the subject of a new book: “Winner Sells All: Amazon, Walmart and the Battle for Our Wallets.” Author Jason Del Rey says that in recent years, the two have been almost mirror images, with Walmart chasing online sales while Amazon opens physical stores.