Which invention, first used commercially in 1974 at a Marsh supermarket in Ohio, revolutionized retail pricing strategies and checkout efficiency?

Before the 1970s, cashiers manually entered every price at checkout, making shopping a time-consuming process and price updates extremely labor-intensive. One technological innovation revolutionized retail by allowing prices to be automatically scanned at checkout. This invention not only sped up the purchase process but transformed inventory management, pricing strategies, and consumer data collection. Test your knowledge about this pivotal retail technology that we now take for granted!

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The Universal Product Code (UPC) barcode system
The electronic cash register (ECR)
The magnetic stripe card reader
The digital price tag system