Which invention/discovery fundamentally changed market research by allowing companies to observe natural consumer behavior rather than relying solely on what consumers say they do?

In the world of inventions and discoveries, understanding consumer behavior has evolved dramatically over the decades. Market research methodologies have transformed how products are developed and marketed. One particular innovation revolutionized how companies gather authentic consumer insights. Test your knowledge about this pivotal invention that changed how we understand what customers really want.

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• The one-way mirror for focus group observation (1950s)
• Eye-tracking technology (1980s)
• The Nielsen television ratings box (1942)
• RFID shopping cart tracking systems (1990s)

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