Amazon is expanding its same-day delivery service for fresh foods, including meat, eggs, and produce, to over 1,000 U.S. cities, with plans to reach 2,300 locations by year-end. The service, free for Prime members on orders over $25, encourages shoppers to add perishables while browsing. Trials in Phoenix and other cities showed first-time grocery customers often return twice as frequently with same-day delivery. Competitors like Instacart, Kroger, Albertsons, DoorDash, and Walmart saw stock declines following the announcement. Amazon has been restructuring its grocery business, integrating Whole Foods under its umbrella and emphasizing household staples, aiming to strengthen its grocery and rural market presence.