In 1916, which revolutionary retail format was introduced by Clarence Saunders that fundamentally changed the customer shopping journey by allowing shoppers to select their own items?

The retail customer journey has evolved dramatically over the centuries, with technological innovations transforming how consumers interact with merchants. One particular innovation in the early 20th century fundamentally changed the retail experience and set the foundation for modern shopping as we know it. Test your knowledge of this pivotal moment in retail history!

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Piggly Wiggly (the first true self-service grocery store)
A&P Economy Stores (the first checkout counter system)
Woolworth's Bargain Basement (the first price-marked merchandise)
Marshall Field's Department Store (the first shopping cart system)