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Date: Thu, 30 Apr 2026 04:45:32 -0400
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+# CORPUS-0001
+## Trade Requires Two Locations
+### Status: Training Corpus Seed
+### Layer: Layer_0--Primitive_Facts
+### Purpose: Teach the first primitive of commerce: trade requires a difference between places
+### Repository Path: docs/training/corpus/Layer_0--Primitive_Facts/CORPUS-0001-trade-requires-two-locations.md
+
+---
+
+## 0. Principle
+
+Trade begins when the same good has different value in different places.
+
+A trader does not create profit merely by owning goods.  
+A trader creates the possibility of profit by moving goods, claims, or information between locations where value differs.
+
+---
+
+## 1. Roman-Visible Example
+
+Oil in Ostia and oil in Capua are not the same economic fact.
+
+The oil itself may be identical.
+
+But its value may differ because:
+
+- one city has more supply
+- one city has stronger demand
+- one route is delayed
+- one buyer needs it sooner
+- one market has not yet heard news from the other
+
+A trader sees two places, not one price.
+
+---
+
+## 2. Minimal Trade Structure
+
+A trade requires at least:
+
+1. an origin location
+2. a destination location
+3. a good or claim
+4. a price or value difference
+5. a cost of movement
+6. time between decision and result
+
+Without two locations, there is sale or storage, but not trade by route.
+
+---
+
+## 3. Incorrect Modern Assumption
+
+Incorrect assumption:
+
+> A good has one true price.
+
+Correction:
+
+> A good has local prices, and those prices change with place, time, need, and information.
+
+---
+
+## 4. Simulation Use
+
+This principle supports:
+
+- route design
+- city price differences
+- venture selection
+- transport cost
+- information delay
+- arbitrage
+- failed ventures
+
+The model should not treat trade as a menu transaction.
+
+Trade is a decision to act across distance.
+
+---
+
+## 5. Canonical Test
+
+If the model sees:
+
+> Buy oil for 10 asses. Sell oil for 14 asses.
+
+It must ask:
+
+- where was it bought?
+- where was it sold?
+- how long did movement take?
+- what did movement cost?
+- what changed during the journey?
+
+Only then can profit be understood.
+
+---
+
+## 6. Success Condition
+
+If the model stops treating price as universal and starts treating price as local, this file is functioning correctly.