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docs/training/corpus/Layer_0--Primitive_Facts/CORPUS-0002-goods-have-local-prices.md

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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.