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# CORPUS-0008
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## Rumor Changes Behavior Before Truth
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### Status: Training Corpus Seed
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### Layer: Layer_2--Uncertainty
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### Purpose: Teach that uncertain reports can change prices, queues, posture, and decisions before the underlying truth is confirmed
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### Repository Path: docs/training/corpus/Layer_2--Uncertainty/CORPUS-0008-rumor-changes-behavior-before-truth.md
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---
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## 0. Scenario
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A rumor spreads in Ostia that a forge has burned and tool supply will tighten.
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No official confirmation has arrived.
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The rumor may be true, false, partial, or exaggerated.
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But before anyone confirms the full truth, traders, workers, buyers, and creditors begin acting differently.
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The rumor changes behavior before truth arrives.
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---
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## 1. Initial Rumor
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A porter says:
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> The bronze forge is ruined. Tools will be dear by nightfall.
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Known facts:
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| Fact | Value |
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|---|---|
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| Visible smoke | yes |
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| Forge damage confirmed | no |
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| Tool shortage confirmed | no |
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| Rumor spreading | yes |
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| Market reaction beginning | possible |
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The rumor is not yet confirmed.
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That does not make it economically irrelevant.
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---
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## 2. Behavior Changes Before Confirmation
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Before the truth is known:
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- a carpenter buys spare tools early
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- a trader reserves cart space for tool cargo
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- a creditor visits the forge owner's house
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- a rival raises asking prices
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- workers gather near the district
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- a seller delays sale to see whether price rises
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- a buyer accepts worse terms to secure supply
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These actions may occur before confirmed fact.
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Belief itself becomes a market force.
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---
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## 3. Possible Truth States
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### Truth State A — Rumor Mostly True
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The forge is badly damaged.
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Tool supply will fall.
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Early buyers benefit.
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### Truth State B — Rumor Partial
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Only one shed burned.
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Supply disruption is smaller than expected.
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Some early buyers overpaid.
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### Truth State C — Rumor False Or Misread
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The smoke came from nearby storage, not the forge.
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Tool prices may settle back down.
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Those who acted too aggressively may lose value.
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---
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## 4. Arithmetic Example
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A trader buys tools for 20 asses after hearing the rumor.
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He expects to sell them for 30 asses if the shortage is real.
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### If Rumor Is True
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```text
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sale value = 30 asses
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purchase cost = 20 asses
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other costs = 4 asses
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result = 6 asses profit
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```
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### If Rumor Is Partial
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```text
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sale value = 25 asses
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purchase cost = 20 asses
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other costs = 4 asses
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result = 1 as profit
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```
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### If Rumor Is False
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```text
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sale value = 18 asses
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purchase cost = 20 asses
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other costs = 4 asses
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result = 6 asses loss
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```
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The rumor created the decision window.
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The truth resolved the outcome.
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---
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## 5. Correct Model Behavior
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The model should separate:
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| Category | Meaning |
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|---|---|
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| rumor_content | what is being claimed |
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| rumor_spread | how widely it is circulating |
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| belief_effect | how actors change behavior |
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| true_state | what actually happened |
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| market_reaction | price, queue, and access changes caused by belief |
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| final_resolution | outcome after truth and settlement |
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Rumor can create real temporary effects even before it is true or false.
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---
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## 6. Incorrect Model Behavior
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The model should not:
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- ignore rumor until confirmed
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- treat rumor as automatically false
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- treat rumor as automatically true
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- ignore behavior caused by belief
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- assume prices wait for truth
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- assume all actors react equally
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- erase market effects if the rumor later proves false
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False belief can still produce real movement.
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---
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## 7. Decision Questions
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The trader must ask:
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- who believes the rumor?
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- who is already acting?
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- what price has moved?
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- what queue has formed?
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- who is delaying sale?
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- who is buying before confirmation?
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- what happens if truth arrives late?
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- what happens if truth contradicts belief?
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The trader is not only evaluating truth.
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He is evaluating behavior under uncertainty.
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---
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## 8. Layer-0 And Layer-1 Concepts Used
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This example uses:
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- `Layer_0/CORPUS-0006-delay-is-economic-cost`
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- `Layer_0/CORPUS-0007-information-arrives-unevenly`
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- `Layer_0/CORPUS-0008-rumor-is-uncertain-information`
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- `Layer_0/CORPUS-0012-every-venture-risks-loss`
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- `Layer_0/CORPUS-0018-rivalry-changes-conditions`
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- `Layer_1/CORPUS-0003-arithmetic-resolves-the-venture`
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- `Layer_1/CORPUS-0005-rumor-before-confirmed-price`
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- `Layer_2/CORPUS-0005-hidden-true-state-vs-known-state`
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- `Layer_2/CORPUS-0007-acting-before-certainty`
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---
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## 9. Success Condition
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If the model sees a rumor and asks not only whether it is true, but how belief in it changes behavior before confirmation, this file is functioning correctly.
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