Which retail innovation, first implemented in 1916, revolutionized shopping by allowing customers to select their own merchandise without clerk assistance?

The retail landscape has evolved dramatically over centuries, with technological innovations reshaping how consumers interact with products and stores. One particularly transformative period occurred in the early 20th century when certain innovations fundamentally changed the retail experience forever. Test your knowledge about a pivotal moment in retail history that set the foundation for modern shopping experiences we take for granted today.

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Piggly Wiggly's self-service grocery store model
Macy's department store credit card system
Sears Roebuck's mail-order catalog distribution centers
Woolworth's price-marked merchandise displays