In what year was the first commercial self-checkout system installed in a retail store?

Retail technology has transformed how we shop over the decades. One innovation that dramatically changed the in-store experience was the self-checkout kiosk. This technology has become ubiquitous in modern retail, but do you know when this retail revolution began? Test your knowledge of retail technology history with this question about the origins of self-checkout systems.

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1992, at Price Chopper in New York
1987, at Walmart's flagship store in Arkansas
2001, at Target's concept store in Minneapolis
1978, at Safeway in California