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

The way we shop has evolved dramatically over the decades, with technological innovations revolutionizing retail experiences. One particular invention from the early 20th century fundamentally changed how consumers interact with products in stores, shifting from clerk-assisted shopping to self-service models. Test your knowledge about this pivotal retail innovation that transformed commerce forever!

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Piggly Wiggly's self-service grocery store concept
Woolworth's department store checkout counters
Sears Roebuck's mail-order catalog system
Marshall Field's shopping basket introduction