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+# CORPUS-0002
+## Goods Have Local Prices
+### Status: Training Corpus Seed
+### Layer: Layer_0--Primitive_Facts
+### Purpose: Teach that price is local, time-bound, and shaped by supply, demand, and information
+### Repository Path: docs/training/corpus/Layer_0--Primitive_Facts/CORPUS-0002-goods-have-local-prices.md
+
+---
+
+## 0. Principle
+
+A good does not have one universal price.
+
+A good has a price in a place, at a time, under current conditions.
+
+The same amphora of oil may be cheap in Ostia and dear in Capua.  
+The good is the same. The market is not.
+
+---
+
+## 1. Roman-Visible Example
+
+A trader hears that oil sells in Ostia for 10 asses.
+
+This does not tell him what oil sells for in Capua.
+
+The Capua price may differ because:
+
+- fewer amphorae arrived there
+- more households need oil
+- a road delay slowed supply
+- a festival increased consumption
+- a rumor caused hoarding
+- buyers have not yet heard that new supply is coming
+
+The trader must learn the local price before judging opportunity.
+
+---
+
+## 2. Minimal Price Structure
+
+A local price depends on at least:
+
+1. location
+2. time
+3. good type and quality
+4. available supply
+5. current demand
+6. information available to buyers and sellers
+7. urgency of buyer or seller
+
+A price without location is incomplete.
+
+---
+
+## 3. Incorrect Modern Assumption
+
+Incorrect assumption:
+
+> The price of oil is 10 asses.
+
+Correction:
+
+> The price of oil is 10 asses in a specific place, at a specific time, under specific conditions.
+
+---
+
+## 4. Simulation Use
+
+This principle supports:
+
+- city-level price tables
+- local market variation
+- rumor-driven price movement
+- supply shocks
+- route-based arbitrage
+- seasonal changes
+- failed assumptions about destination markets
+
+The model should not copy one city’s price to another city unless a rule says prices are linked.
+
+---
+
+## 5. Canonical Test
+
+If the model sees:
+
+> Oil costs 10 asses.
+
+It must ask:
+
+- where?
+- when?
+- what quality?
+- who is buying?
+- who is selling?
+- is the price current or stale?
+- has new information arrived?
+
+Only then is the price usable.
+
+---
+
+## 6. Success Condition
+
+If the model stops treating price as a property of the good and starts treating price as a condition of the local market, this file is functioning correctly.