Which retail innovation, introduced in 1916 by Clarence Saunders, revolutionized shopping by allowing customers to select their own merchandise rather than having clerks gather items?

The retail landscape has transformed dramatically over centuries, with innovations that fundamentally changed how people shop. One particular retail innovation from the early 20th century revolutionized the shopping experience and set the foundation for modern supermarkets and department stores. Test your knowledge about this pivotal moment in retail history that changed consumer behavior forever.

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Piggly Wiggly (the first true self-service grocery store)
Marshall Field's 'Bargain Basement' (the first discount department store section)
Montgomery Ward's Catalog (the first mail-order business model)
Woolworth's 'Five and Dime' (the first fixed-price merchandising)