Which retail innovation, first introduced in 1916, revolutionized grocery shopping by allowing customers to select their own merchandise rather than having clerks gather items for them?

The history of retail has witnessed remarkable transformations that shaped how we shop today. From humble general stores to massive department stores and eventually online marketplaces, retail history reveals fascinating insights about economic development, consumer behavior, and technological innovation. This trivia question explores a pivotal moment in retail history that fundamentally changed the shopping experience.

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Self-service shopping (Piggly Wiggly stores)
The shopping cart (introduced by Sylvan Goldman)
Barcode scanning system
Department store credit cards