Which retail innovation from the 1930s revolutionized shopping by introducing the concept of 'self-service' where customers could select products without clerk assistance?

In the evolution of retail history, certain innovations fundamentally changed how consumers interact with products. Before today's digital transformation, physical retail spaces underwent revolutionary changes that set the foundation for modern commerce. This trivia challenges you to identify a pivotal moment in retail history that transformed the shopping experience forever and influenced merchandising strategies still used today.

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The shopping mall concept pioneered by the Country Club Plaza in Kansas City
The supermarket model pioneered by King Kullen, which Michael Cullen opened in Jamaica, Queens in 1930
Sears catalog's introduction of illustrated product photography replacing line drawings
The department store 'bargain basement' concept pioneered by Filene's in Boston