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

Throughout history, retail has evolved dramatically with revolutionary innovations that changed how people shop. From ancient marketplaces to modern digital experiences, retail innovation has reflected broader societal and technological changes. This trivia question explores a pivotal moment in retail history that fundamentally transformed the shopping experience and set the stage for modern retail as we know it today. Test your knowledge about this significant retail milestone!

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Piggly Wiggly's self-service grocery store model
Sears Roebuck's mail-order catalog system
F.W. Woolworth's fixed price 'Five-and-Dime' stores
Marshall Field's department store customer service policy