Which historic retail innovation of the 1930s fundamentally changed product marketing by allowing consumers to directly select merchandise without clerk assistance for the first time?

The retail landscape we know today was shaped by pioneering strategies and innovations from decades past. This poll explores a significant historical development in retail marketing that transformed how products were presented to consumers. Test your knowledge about a revolutionary shift in retail history that continues to influence modern shopping experiences and marketing approaches.

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Self-service grocery stores (pioneered by Piggly Wiggly)
Department store catalog showrooms (pioneered by Sears)
Window display merchandising (pioneered by Marshall Field's)
Door-to-door demonstration selling (pioneered by Fuller Brush Company)