Which early 20th century retail innovation, now considered a forerunner to sustainable retail practices, was first introduced by Clarence Saunders in 1916?

Throughout history, retail has undergone dramatic transformations. From ancient marketplaces to modern e-commerce, the way we buy and sell goods has reflected broader societal changes. This trivia question focuses on a pivotal innovation in retail history that forever changed how consumers interact with products and influenced modern sustainability practices. Test your knowledge about this significant retail transformation that bridges historical commerce with contemporary sustainability concerns.

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Self-service grocery store (Piggly Wiggly)
Reusable shopping bags made from cotton
The money-back guarantee policy
Standardized product packaging with recycling instructions