Which retail innovation, introduced in the 1930s, revolutionized shopping by allowing consumers to select their own items rather than having clerks retrieve products from behind counters?

Throughout history, certain product innovations have fundamentally transformed the retail landscape and consumer behavior. These breakthrough moments didn't just create new products - they established entirely new categories, shopping patterns, and consumer expectations that we still see today. Test your knowledge about a pivotal retail innovation that altered the course of commerce history!

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Self-service supermarkets (pioneered by Piggly Wiggly)
Department store credit cards (introduced by Wanamaker's)
Mail-order catalogs (popularized by Montgomery Ward)
Automated checkout registers (developed by NCR Corporation)