Which retail innovation from the 1930s revolutionized product design and retail operations by allowing customers to directly interact with merchandise without salesperson assistance?

The history of retail has seen dramatic transformations in how products are designed, displayed, and sold. From ancient marketplaces to digital storefronts, retail innovation has reflected broader societal and technological changes. This poll tests your knowledge about a pivotal moment in retail product design history that fundamentally changed how consumers interact with merchandise.

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Self-service grocery stores pioneered by Piggly Wiggly
Open-display merchandising introduced by Selfridges
Mail-order catalogs popularized by Sears Roebuck
Department store elevator systems by Marshall Field's