Which of these inventions most dramatically transformed the retail customer journey by enabling consumers to compare products and prices instantly without visiting physical stores?

Throughout history, certain product inventions have fundamentally altered consumer psychology and shopping patterns. These revolutionary discoveries didn't just create new market categories—they transformed how people interact with products and brands. This trivia question explores one such invention that radically changed retail customer journey and experience. Can you identify which technology caused the most dramatic shift in how consumers discover and purchase products?

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• The UPC barcode (1974)
• The smartphone with mobile internet (2007)
• The credit card (1950)
• The self-checkout kiosk (1992)

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