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

The history of retail has seen dramatic transformations that shaped consumer culture as we know it today. From the earliest marketplaces to modern shopping experiences, retail innovations have reflected changing social needs and technological capabilities. This trivia question focuses on a pivotal moment in retail history that fundamentally changed how people shopped and how brands presented themselves to consumers.

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Self-service grocery store (Piggly Wiggly)
Department store with multiple sections (Macy's)
Mail-order catalog shopping (Sears Roebuck)
Discount retail chain model (Woolworth's)