Which retail marketing innovation, first introduced in the 1910s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

The history of retail marketing has seen dramatic shifts over centuries, with various techniques rising and falling in popularity. One particular innovation revolutionized how customers interacted with products and transformed the shopping experience forever. Test your knowledge about this pivotal moment in retail history that continues to influence modern shopping behaviors and store designs.

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Self-service grocery stores (Piggly Wiggly model)
Department store catalogs with mail ordering
Window displays with mannequins
Printed newspaper advertisements with coupons