In retail history, which pioneering innovation from the 1910s-1920s first allowed customers to directly interact with products without clerk assistance, revolutionizing the customer experience?

Long before digital experiences and modern marketing strategies, retail pioneers were revolutionizing how customers interacted with products. This trivia question explores a pivotal innovation in retail history that fundamentally changed the customer experience and set the foundation for modern shopping behaviors. Test your knowledge about retail history innovations that shaped how products were presented and experienced by consumers!

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Self-service grocery stores (pioneered by Piggly Wiggly)
Department store mannequin displays (pioneered by Marshall Field's)
Mail-order product catalogs with photographs (pioneered by Sears Roebuck)
Window shopping displays with electric lighting (pioneered by Macy's)