In what year was the world's first commercially successful self-checkout system installed in a retail store?

Retail innovation has transformed how we shop over the decades. Self-checkout technology represented a major shift in the retail experience, giving customers more control while allowing stores to optimize staff allocation. This innovation required significant technical development and customer adoption strategies. Test your knowledge about this retail technology milestone that has now become ubiquitous in stores worldwide.

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1992 (Price Chopper supermarket in New York)
1984 (Walmart Supercenter in Arkansas)
2001 (Tesco Extra in London)
1978 (Kroger store in Cincinnati)