Which grocery retailer first introduced and successfully implemented self-checkout technology in its stores?

The retail landscape has been dramatically transformed by technological innovations over the decades. One particular innovation changed how customers interact with stores, reduced labor costs, and altered the checkout experience forever. Test your knowledge about this significant retail breakthrough that has become ubiquitous in modern shopping environments.

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Kroger (1992)
Price Chopper (1987)
Albertsons (1995)
Sainsbury's (1995)