Which retail innovation, introduced in the 1930s, revolutionized shopping habits by allowing customers to select their own merchandise without clerk assistance for the first time?

Throughout history, retail innovations have transformed how we shop. From ancient marketplaces to modern malls, shopping habits have evolved dramatically. This poll tests your knowledge about a pivotal moment in retail history that fundamentally changed consumer behavior and set the stage for modern shopping experiences. Think you know your retail history? Let's see how well you understand the innovations that shaped today's shopping landscape!

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Self-service grocery stores (pioneered by Piggly Wiggly)
Department stores with fixed price tags (introduced by John Wanamaker)
Mail-order catalogs (popularized by Montgomery Ward)
Shopping malls with multiple stores (developed by the Southdale Center)