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docs/pricing.md

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+# Pricing
+
+Pricing recommendations should be advisory, not blocking.
+
+## Rules
+
+- Prefer recently sold listings over active listing prices
+- Store the source and retrieval time for every estimate
+- Keep manual overrides available for every item
+- Fall back to the last known local estimate if the external source fails
+
+## Later integration
+
+The first implementation can use a service wrapper for eBay sold comps or another source without coupling the rest of the app to a single marketplace.