Which innovative retail strategy, first implemented in 1916, revolutionized grocery shopping by introducing self-service shopping where customers could select their own products?

The retail landscape has evolved dramatically throughout history, transforming how people shop and how merchants sell their goods. From ancient marketplaces to modern digital storefronts, retail strategies have adapted to changing technologies, consumer behaviors, and economic conditions. This trivia question focuses on a pivotal moment in retail history that forever changed shopping patterns and business strategies in America.

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Piggly Wiggly's self-service store model
Sears Roebuck's mail-order catalog system
A&P's economy store concept
Woolworth's five-and-dime pricing strategy