Which retail innovation from the early 20th century was first introduced by Piggly Wiggly in 1916, revolutionizing how customers interact with products in stores?

The evolution of retail has been shaped by groundbreaking innovations that transformed how consumers shop and how businesses operate. From department stores to digital commerce, retail history contains fascinating examples of companies that pioneered concepts we now take for granted. This trivia question explores a pivotal moment in retail history that fundamentally changed consumer experiences and set the stage for modern retail practices.

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Self-service shopping (where customers could select their own merchandise)
Point-of-sale cash registers with receipt printing
Shopping carts with wheels
Loyalty card program with purchase tracking