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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 citys 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.