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

Throughout history, retail has evolved dramatically with technological and conceptual innovations that transformed how consumers interact with products. From ancient marketplaces to modern shopping experiences, certain retail innovations stand out for their profound impact on commerce and consumer behavior. This trivia question focuses on a pivotal moment in retail history that fundamentally altered the shopping landscape and created the foundation for modern retail experiences. Test your knowledge of retail history with this challenging question!

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Piggly Wiggly's self-service grocery store model
Macy's department store window displays
Sears Roebuck mail-order catalog shopping
F.W. Woolworth's fixed-price 'five and dime' stores