Which retail innovation from the 1910s-1920s fundamentally transformed store layouts and led to the modern self-service shopping experience we know today?

The history of retail is filled with pivotal innovations that transformed how people shop. Some innovations were so revolutionary they completely changed consumer behavior and set new industry standards. This poll tests your knowledge of a critical turning point in retail history that shaped modern shopping experiences and store layouts. Do you know which innovation truly revolutionized the retail landscape in the early 20th century?

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Piggly Wiggly's self-service store model (1916)
Sears Roebuck's mail-order catalog system (1893)
Marshall Field's introduction of department store escalators (1905)
F.W. Woolworth's five-and-dime pricing strategy (1879)