Which retail innovation, first introduced by Piggly Wiggly in 1916, revolutionized food shopping by allowing customers to select their own products directly from shelves?

The supermarket industry has evolved dramatically over decades through innovations that changed how we shop for food. From traditional counter service to modern self-service models, technological and design breakthroughs have shaped our grocery shopping experience. This trivia question focuses on a pivotal retail innovation that transformed the food shopping landscape and consumer behavior forever.

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Self-checkout kiosks
Self-service shopping (where customers select their own items rather than requesting them from clerks)
Shopping carts with wheels
Barcode scanning technology