Which retail innovation, first implemented in 1916, revolutionized store layouts by allowing customers to select their own merchandise without clerk assistance?

The way we shop today seems obvious - walking through aisles, selecting products ourselves, and bringing them to checkout. But this retail model wasn't always the norm! Store layouts and shopping experiences underwent a revolutionary transformation in the early 20th century that fundamentally changed consumer behavior and retail strategy forever. Test your knowledge about this pivotal moment in retail history that shaped modern commerce as we know it.

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Piggly Wiggly's self-service grocery format
Woolworth's department store model
Sears Roebuck's catalog showroom
A&P's supermarket chain concept