Simple maps show where prices cluster higher or lower for everyday items. Even with basic tools, geotagged entries create compelling visual stories: one corridor consistently expensive, another reliably affordable. We annotate school zones, transit hubs, and construction sites, noting how foot traffic and access influence costs. These maps guide shoppers, alert organizers to pressure points, and help independent retailers compare themselves fairly against nearby competitors without guesswork or anecdotes.
A phone camera, a shared spreadsheet, and receipt OCR can carry you surprisingly far. We extract item names, quantities, sizes, taxes, and discounts, then normalize units for apples-to-apples comparisons. Version control and clear naming prevent chaos. Small teams can handle dozens of entries weekly with minimal friction. The goal is transparency and reproducibility, so anyone can audit the steps, spot errors, or extend the work with additional, responsibly gathered observations.
We set gentle alerts for multi-week changes beyond normal variance, avoiding panic over single-day spikes. Thresholds prompt a second look, a follow-up visit, or a conversation with staff. Context is key: a promo ending is different from a wholesale shift. When alerts trigger, we collect fresh data, update maps, and share a measured summary. The aim is steady attention, not alarm, helping neighbors act thoughtfully rather than react impulsively.
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