Which retail innovation, first widely implemented in the early 20th century, revolutionized shopping by allowing customers to select products themselves rather than asking clerks behind counters?

Retail has evolved dramatically throughout history, with certain innovations completely transforming how consumers interact with products. This trivia question explores a pivotal moment in retail history that fundamentally changed shopping behaviors and set the stage for modern retail operations. Test your knowledge about how product presentation and customer access to goods evolved from traditional merchant-controlled experiences to the self-service model we know today.

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Self-service grocery stores (like Piggly Wiggly, founded 1916)
Department store catalogs (like Sears Roebuck)
The invention of shopping carts (1937)
Coin-operated vending machines (popularized in the 1880s)