Which revolutionary retail innovation was first introduced at the Piggly Wiggly store in Memphis, Tennessee in 1916, fundamentally changing how people shopped?

The history of retail has been shaped by groundbreaking innovations that transformed how people shop. From humble beginnings to today's complex retail landscape, certain products and inventions stand out as true game-changers. This trivia question focuses on one such pivotal moment in retail history that fundamentally changed the consumer experience forever. Test your knowledge of retail's revolutionary past!

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Self-service shopping (where customers could select their own items rather than requesting them from clerks)
The shopping cart (initially called 'folding basket carriers')
Price tags (replacing the previous system of haggling for each purchase)
Checkout counters with mechanical cash registers