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

The history of retail contains fascinating turning points that revolutionized how people shop. From ancient marketplaces to modern e-commerce, retail innovation has shaped economies and cultures worldwide. This trivia question focuses on a pivotal moment in retail history that transformed consumer behavior and laid the groundwork for today's shopping experience. Test your knowledge about one of the most significant retail innovations that changed shopping forever!

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Self-service grocery store (Piggly Wiggly)
Department store credit card (Sears)
Automated checkout counter (NCR)
Mail-order catalog with photos (Montgomery Ward)