Which retail innovation, introduced in 1916, fundamentally changed shopping by allowing customers to select their own merchandise without clerk assistance for the first time?

The retail landscape has transformed dramatically over centuries, but some innovations fundamentally changed how we shop forever. Test your knowledge about a pivotal moment in retail history that shaped the consumer experience we know today. This question explores how early retail innovations set the foundation for modern shopping practices and consumer expectations.

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Piggly Wiggly's self-service grocery store model
Macy's introduction of the price tag system
Woolworth's implementation of checkout counters
Sears Roebuck's mail-order catalog system