Which retail innovation, first introduced in 1916, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance?

Throughout history, retail has transformed dramatically - from ancient markets to modern shopping experiences. This poll tests your knowledge about a pivotal moment in retail history that forever changed how people shop. The development of certain retail innovations has shaped consumer culture and transformed economies across centuries. Test your knowledge about this significant retail advancement that revolutionized commerce!

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Self-service grocery store (Piggly Wiggly)
Department store credit card (Sears)
Mail-order catalog system (Montgomery Ward)
Shopping cart (Humpty Dumpty supermarket)