In retail history, which innovation first allowed customers to browse merchandise freely without clerk assistance, fundamentally changing shopping behavior in the 1910s?

Throughout history, retail has transformed dramatically from simple trade to complex commercial experiences. This poll explores a pivotal moment in retail history that forever changed how consumers shop. Test your knowledge about an innovation that revolutionized the retail landscape and set the foundation for modern shopping experiences we take for granted today.

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Self-service grocery stores introduced by Piggly Wiggly in 1916
Department store display windows pioneered by Marshall Field's in 1902
Mail-order catalogs popularized by Montgomery Ward in 1908
Cash register systems introduced by NCR in 1914