Which visualization technique did Macy's famously pioneer in 2012 to analyze customer movement patterns across their stores in different geographic regions?

Retail customer analytics has revolutionized how companies understand shopping behaviors across different geographic regions. Modern retailers use sophisticated tools to visualize customer engagement patterns, optimize store layouts, and make data-driven decisions. This trivia question explores a specific retail analytics visualization technique that transformed how Macy's understood their in-store customer journey across their nationwide locations.

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Heat mapping
Geographic information system (GIS) overlays
Regional funnel analysis
Spatial density plots