Which retail innovation, first introduced in 1916, fundamentally changed shopping behavior and is considered the precursor to modern supermarkets?

The retail landscape we know today didn't appear overnight. Throughout history, revolutionary retail concepts transformed how people shop and consume products. This trivia question explores a pivotal moment in retail history that changed consumer culture forever. Test your knowledge of how retail giants emerged and revolutionized the shopping experience in ways that continue to influence modern product marketing and development.

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Piggly Wiggly's self-service shopping model where customers selected their own merchandise
Woolworth's introduction of the price tag system with fixed, marked prices
Sears Roebuck's mail-order catalog allowing rural customers to shop remotely
Marshall Field's department store concept with multiple product categories under one roof