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

The history of retail has seen dramatic transformations that shaped how we shop today. From humble market stalls to elaborate department stores to digital commerce, retail evolution reflects broader societal changes. This poll tests your knowledge about a pivotal moment in retail history that fundamentally changed consumer shopping habits and set the stage for modern retail operations. Can you identify this historic retail innovation that revolutionized how consumers interacted with products?

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Self-service grocery stores (Piggly Wiggly)
Department store credit cards
Mail-order catalogs with home delivery
Price tags with fixed pricing