Which retail display innovation, first widely implemented in 1916, revolutionized shopping by allowing customers to select products themselves rather than requesting them from clerks behind counters?

Before the digital age revolutionized retail, physical product displays underwent their own transformations that fundamentally changed how consumers interacted with goods. One innovation in particular during the early 20th century dramatically shifted the retail landscape and consumer purchasing behavior, creating the foundation for modern self-service shopping. Test your knowledge of this pivotal moment in retail product development history!

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The self-service grocery store (Piggly Wiggly model)
The department store window display
The spinning merchandise rack
The illuminated glass showcase