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+# CORPUS-0018
+## Rivalry Changes Conditions
+### Status: Training Corpus Seed
+### Layer: Layer_0--Primitive_Facts
+### Purpose: Teach that ventures occur in markets where other actors may pursue, alter, or close the same opportunity
+### Repository Path: docs/training/corpus/Layer_0--Primitive_Facts/CORPUS-0018-rivalry-changes-conditions.md
+
+---
+
+## 0. Principle
+
+A venture does not happen in an empty market.
+
+Other actors may see the same opportunity, move first, bid differently, reserve transport, influence access, or change expectations before the trader settles his own venture.
+
+Rivalry can change conditions without any dramatic confrontation.
+
+A good plan can become worse because another actor acted sooner.
+
+---
+
+## 1. Roman-Visible Example
+
+A trader hears that oil may sell well in Capua.
+
+He goes to reserve cart space from Ostia.
+
+Another trader has already reserved the best cart and offered the driver a higher payment.
+
+The oil price in Capua may still be favorable.
+
+But the trader's conditions have changed:
+
+- movement costs rise
+- departure may be delayed
+- a rival may arrive first
+- buyers may reduce offers after the rival sells
+- the original margin may shrink
+
+The opportunity was real, but it was not waiting untouched.
+
+---
+
+## 2. Minimal Rivalry Structure
+
+Rivalry requires at least:
+
+1. more than one actor
+2. overlapping interest
+3. scarce good, route, contact, information, or time
+4. action by one actor that changes conditions for another
+5. possible change in cost, price, access, or timing
+
+Rivalry does not require hostility.
+
+It can arise from ordinary competition under scarcity.
+
+---
+
+## 3. Incorrect Modern Assumption
+
+Incorrect assumption:
+
+> Once an opportunity is identified, it remains available until the trader chooses to act.
+
+Correction:
+
+> Opportunities change as other actors notice, move, reserve, buy, sell, delay, or negotiate.
+
+The trader must consider who else may act.
+
+---
+
+## 4. Simulation Use
+
+This principle supports:
+
+- competing merchants
+- changing prices
+- cart and warehouse scarcity
+- auction-like pressure
+- route timing
+- access competition
+- reputation contests
+- shrinking margins
+- first-mover advantage
+
+The model should not treat opportunities as static menu options.
+
+---
+
+## 5. Canonical Test
+
+If the model sees:
+
+> The trader identifies a profitable route.
+
+It must ask:
+
+- who else may know?
+- who can move faster?
+- who controls transport?
+- who can offer better terms?
+- who has stronger access?
+- can a rival reach the buyer first?
+- does rival action change the price or cost?
+- how long before the opportunity closes?
+
+Only then can the venture be evaluated.
+
+---
+
+## 6. Success Condition
+
+If the model stops treating opportunities as waiting objects and starts treating them as contested conditions shaped by other actors, this file is functioning correctly.