What technology did Amazon first patent in 2014 and later implement in Amazon Go stores that revolutionized the physical shopping experience?

Amazon has revolutionized retail through numerous technological innovations. One particularly groundbreaking system fundamentally changed how physical retail spaces operate, eliminating a pain point that shoppers had experienced for decades. Test your knowledge of retail innovation that bridges the gap between digital convenience and physical shopping experiences.

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Just Walk Out technology (automatic checkout without scanning)
Amazon Dash buttons (one-touch reordering devices)
Amazon Echo shopping (voice-activated purchasing)
Dynamic pricing digital shelf labels