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

Throughout history, retail has evolved dramatically from simple bartering to sophisticated shopping experiences. The 19th and 20th centuries saw revolutionary innovations that forever changed how we shop. This trivia question explores one of the most significant developments in retail history that fundamentally transformed the customer experience and laid the foundation for modern commerce as we know it today.

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Self-service grocery store (Piggly Wiggly)
Department store catalog (Sears Roebuck)
Shopping mall (Country Club Plaza)
Retail loyalty program (S&H Green Stamps)