Which retail pricing innovation, invented in 1916, pioneered the concept of self-service shopping and dramatically changed product packaging requirements?

In the world of retail and product development, some innovations completely transform how consumers shop. Pricing strategies have evolved dramatically over the centuries, with certain inventions creating entirely new business models. One such revolutionary approach emerged in the early 20th century, fundamentally changing consumer expectations and retail operations worldwide. Test your knowledge about this game-changing pricing innovation!

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The Piggly Wiggly self-service grocery store model
The Montgomery Ward mail-order catalog pricing system
The Woolworth's five-and-dime fixed pricing approach
The Marshall Field's 'give the lady what she wants' satisfaction guarantee