Which retail innovation from the 1920s-30s fundamentally changed product marketing by allowing customers to select their own merchandise without clerk assistance for the first time?

The history of retail has seen dramatic transformations that have shaped how products are marketed and sold. From ancient marketplaces to modern shopping experiences, retail strategies have evolved alongside societal changes. This poll tests your knowledge about a significant shift in retail history that fundamentally changed shopping habits and product marketing approaches in America.

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Self-service grocery stores (like Piggly Wiggly)
Mail-order catalogs (like Sears Roebuck)
Department stores (like Macy's)
Door-to-door sales networks (like Fuller Brush)