LOS ANGELES/WASHINGTON—Amazon’s promise of one-day shipping threatens to upend the retail sector, but its rivals’ physical stores give the likes of Walmart and Target powerful assets that Amazon itself is scrambling to match.
Amazon.com Inc., seeking to stem slowing sales growth, is plowing $800 million this quarter alone into its next-day package delivery project, something even Walmart Inc., the world’s biggest retailer, will be hard-pressed to duplicate.
