Which historical retail innovation first allowed customers to browse merchandise freely without a salesperson's assistance, revolutionizing product displays and self-service shopping?

Throughout history, retail innovations have transformed how consumers interact with products. From the first department stores to digital shopping platforms, each breakthrough has shaped consumer culture and expectations. This trivia question explores a pivotal moment in retail history that changed product launches and shopping habits forever.

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Piggly Wiggly's self-service grocery store model (1916)
Macy's department store grand opening (1858)
Sears Roebuck mail-order catalog (1893)
Marshall Field's bargain basement concept (1879)