Which retail innovation, first introduced in 1916, fundamentally transformed shopping by allowing customers to select their own merchandise without clerk assistance?

The retail industry has undergone remarkable transformations throughout history. Before modern supermarkets, malls, and e-commerce platforms, innovative merchants were pioneering revolutionary approaches to selling goods. This trivia question focuses on a pivotal moment in retail history that forever changed how consumers shop and how businesses operate. Test your knowledge about this fundamental shift in retail strategy that continues to influence industry practices today!

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Self-service grocery stores (Piggly Wiggly)
Department store catalogs (Sears Roebuck)
Retail loyalty cards (Co-operative Trading Stamps)
Cash register systems (National Cash Register Company)