Which retail innovation, first introduced in 1916 by Clarence Saunders, fundamentally changed how customers interacted with products and is considered the precursor to modern supermarkets?

The history of retail has been shaped by innovative strategies and technologies that transformed how people shop. From ancient marketplaces to modern digital commerce, retail locations have evolved dramatically. This trivia question focuses on a pivotal moment in retail history that revolutionized the shopping experience and set standards still influencing store designs today.

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Piggly Wiggly's self-service shopping model
Woolworth's fixed-price merchandising system
Marshall Field's department store browsing concept
Sears Roebuck's catalog showroom approach