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

The way we shop today seems natural, but self-service retail was once a revolutionary concept. Before modern supermarkets and department stores, shopping involved clerks fetching products from behind counters. This trivia question explores a pivotal innovation in retail history that fundamentally changed consumer behavior and shopping experiences forever. Test your knowledge of this transformative retail development!

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Piggly Wiggly's self-service grocery store format
Sears Roebuck's mail-order catalog shopping
Woolworth's fixed-price merchandise system
Marshall Field's department store customer service model