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

The history of retail has seen dramatic transformations over centuries. From ancient marketplaces to today's omnichannel experiences, certain innovations fundamentally changed how consumers shop. This trivia question focuses on a pivotal moment in retail history that revolutionized the customer experience and set the foundation for modern retail practices. Test your knowledge about this significant retail transformation that continues to influence shopping behaviors today.

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Self-service shopping (Piggly Wiggly's innovation)
Department store concept (Marshall Field's approach)
Mail-order catalogs (Sears Roebuck's system)
Shopping carts (Goldman's invention)