Which retail innovation, introduced in 1916, revolutionized food shopping by allowing customers to select their own products rather than having clerks gather items from a list?

The way we shop for food has dramatically evolved over the past century. From small specialty shops to modern supermarkets, food retail has undergone revolutionary changes in logistics, customer experience, and store design. This poll tests your knowledge of a pivotal moment in retail history that forever changed how consumers interact with food products. Can you identify when this significant shift in grocery shopping occurred?

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Self-service grocery stores (Piggly Wiggly)
Refrigerated display cases
Barcode scanning systems
Shopping carts with wheels