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

Before supermarkets and department stores dominated retail, shopping looked very different. The evolution of retail spaces has transformed not just how we shop, but shaped cultural and economic history. This trivia question explores a pivotal retail innovation that forever changed the shopping landscape and set the foundation for modern commerce as we know it today.

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• Piggly Wiggly's self-service grocery store model
• Woolworth's five-and-dime store concept
• Marshall Field's department store with fixed pricing
• Sears Roebuck's mail-order catalog shopping

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