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

Throughout history, retail has undergone dramatic transformations that have shaped our consumer culture. From ancient marketplaces to modern e-commerce giants, retail innovations have reflected societal changes and technological advances. This trivia question focuses on a pivotal moment in retail history that revolutionized how Americans shopped and forever changed consumer behavior. Test your knowledge of 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 five-and-dime store concept
A&P's supermarket chain format