Which country introduced the world's first self-service grocery store concept, revolutionizing retail by allowing customers to select their own items without clerk assistance?

Geographic factors have always shaped retail innovation throughout history. From ancient marketplaces along trade routes to today's location-optimized megastores, understanding the geographic origins of retail concepts gives insight into how commerce evolves across different cultures and landscapes. Test your knowledge about a pivotal moment in retail history that transformed how we shop worldwide!

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United States (Piggly Wiggly, founded 1916 in Memphis)
United Kingdom (Sainsbury's experimental self-service store, 1949)
France (Carrefour's first hypermarket concept, 1963)
Sweden (IKEA's showroom-warehouse model, 1958)