In retail history, which pioneering data collection innovation from the 1930s first allowed mass retailers to systematically analyze customer preferences and purchasing patterns?

Before sophisticated AI and big data, retailers still found ways to understand their customers. This trivia explores a pivotal moment in retail history when customer insights fundamentally changed merchandising strategies. The innovation discussed transformed how retailers understood consumer behavior and represented a major shift in data-driven decision making that continues to influence modern retail analytics and sentiment analysis techniques.

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The Nielsen Retail Index, which tracked product movement across representative stores
Montgomery Ward's 'Consumer Preference Cards' distributed with mail-order catalogs
Sears' in-store mechanical punch-card tracking system for inventory
The Gallup Shopping Survey, which interviewed consumers about brand preferences