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

Before modern supermarkets and department stores dominated the retail landscape, various innovations shaped how people shopped and interacted with consumer goods. This trivia question explores a pivotal moment in retail history that transformed product distribution and consumer habits, setting the foundation for modern retail experiences we take for granted today.

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Piggly Wiggly's self-service shopping model
Sears Roebuck's mail-order catalog system
Woolworth's fixed-price merchandise strategy
A&P's store-branded product lines