Which retail innovation, first widely implemented in the 1910s, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

Before mega-malls and e-commerce dominated our shopping habits, retail underwent several revolutionary transformations. This trivia question explores a pivotal moment in retail history that fundamentally changed how consumers interacted with products and shaped the modern shopping experience we know today. Test your knowledge about the evolution of retail spaces and the innovative strategies that transformed commerce in the early 20th century.

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Self-service grocery stores (pioneered by Piggly Wiggly in 1916)
Department store escalators (popularized by Harrods in 1898)
Cash register with receipt printing (introduced by NCR in 1884)
Shopping carts with wheels (invented by Sylvan Goldman in 1937)