Which retail innovation, first implemented in 1916 by Clarence Saunders, fundamentally changed shopping by allowing customers to select their own merchandise rather than requesting items from clerks?

The retail industry has transformed dramatically throughout history, with innovations that shaped how we shop today. This trivia question focuses on a pivotal retail strategy that revolutionized the shopping experience in the early 20th century. Test your knowledge of retail history and see if you can identify this game-changing innovation that set the foundation for modern shopping experiences.

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Piggly Wiggly self-service grocery stores
Woolworth's fixed-price merchandise system
Sears Roebuck catalog ordering system
Marshall Field's 'give the lady what she wants' personal shopping