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

The history of retail has been shaped by groundbreaking innovations and visionary entrepreneurs. From humble market stalls to global empires, the evolution of how we buy and sell products reflects broader social and technological changes. This trivia question focuses on a pivotal moment in retail history that transformed how consumers interact with products and established practices we take for granted today.

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Piggly Wiggly's self-service store model
Woolworth's five-and-dime pricing strategy
Sears Roebuck's mail-order catalog system
Marshall Field's department store layout