Which retail innovation, first widely implemented in the early 1900s, transformed the customer journey by allowing shoppers to select their own merchandise without clerk assistance?

The retail landscape has transformed dramatically over the centuries. Before department stores, shopping malls, and e-commerce, retail was a vastly different experience. This poll tests your knowledge of a pivotal innovation that revolutionized how consumers interact with products and fundamentally changed the retail customer journey. This development from the late 1800s/early 1900s created a new shopping paradigm that continues to influence retail strategy today.

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Self-service grocery stores (pioneered by Piggly Wiggly in 1916)
Mail-order catalogs (popularized by Montgomery Ward in the 1880s)
Department store shopping floors (introduced by Bon Marché in Paris, 1852)
Shopping arcades (like London's Burlington Arcade, established 1819)