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docs/training/corpus/Layer_1--Worked_Examples/CORPUS-0009-credit-allows-action-without-coin.md

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-# CORPUS-0009
-## Credit Allows Action Without Coin
-### Status: Training Corpus Seed
-### Layer: Layer_1--Worked_Examples
-### Purpose: Teach that a trader may act without immediate coin when trust, collateral, or reputation allows deferred settlement
-### Repository Path: docs/training/corpus/Layer_1--Worked_Examples/CORPUS-0009-credit-allows-action-without-coin.md
-
----
-
-## 0. Scenario
-
-A trader in Ostia sees an opportunity to send oil to Capua.
-
-He does not have enough coin available to buy the oil outright.
-
-A seller agrees to provide the oil now, with payment due after the Capua sale.
-
-The trader can act without immediate coin because credit is extended.
-
-This does not remove cost.
-
-It changes the timing and risk of settlement.
-
----
-
-## 1. Known Facts
-
-| Fact | Value |
-|---|---:|
-| Origin | Ostia |
-| Destination | Capua |
-| Good | oil |
-| Oil purchase value | 20 asses |
-| Immediate coin paid | 0 asses |
-| Payment due after sale | 22 asses |
-| Movement and handling cost | 6 asses |
-| Expected sale price in Capua | 34 asses |
-
-Expected total cost after settlement:
-
-```text
-seller payment:        22 asses
-movement and handling:  6 asses
--------------------------------
-total cost:            28 asses
-```
-
-Expected profit:
-
-```text
-34 - 28 = 6 asses profit
-```
-
-The trader did not avoid purchase cost.
-
-He postponed it and paid for the privilege through higher settlement.
-
----
-
-## 2. Why The Seller Agrees
-
-The seller may extend credit because:
-
-- the trader has paid before
-- a witness confirms the agreement
-- the trader has a respected contact
-- the trader pledges future goods
-- the seller wants access to the Capua buyer
-- the seller has no better immediate buyer
-
-Credit depends on trust, enforceability, or expected advantage.
-
----
-
-## 3. First Incorrect Calculation
-
-A weak model may calculate:
-
-```text
-sale value = 34 asses
-movement cost = 6 asses
-profit = 28 asses
-```
-
-This is wrong.
-
-The oil was not free.
-
-Payment was deferred.
-
-The seller must still be paid.
-
----
-
-## 4. Correct Calculation
-
-The correct calculation includes the deferred obligation:
-
-```text
-sale value:              34 asses
-deferred seller payment: 22 asses
-movement and handling:    6 asses
---------------------------------
-final result:             6 asses profit
-```
-
-Credit changes timing.
-
-It does not erase cost.
-
----
-
-## 5. Risk Variants
-
-### Variant A — Sale Succeeds
-
-The oil sells for 34 asses.
-
-```text
-sale value = 34 asses
-total cost = 28 asses
-result = 6 asses profit
-```
-
-The trader pays the seller and preserves trust.
-
-### Variant B — Price Falls
-
-The oil sells for only 26 asses.
-
-```text
-sale value = 26 asses
-total cost = 28 asses
-result = 2 asses loss
-```
-
-The trader may still owe the seller 22 asses.
-
-### Variant C — Delayed Payment
-
-The sale succeeds, but the buyer pays late.
-
-The trader has profit on paper but cannot settle the seller on time.
-
-Trust may decline even if the venture is eventually profitable.
-
----
-
-## 6. Correct Model Behavior
-
-The model should record:
-
-```text
-coin_stock_initial: low
-credit_extended: true
-deferred_obligation_created: 22 asses
-movement_cost_due: 6 asses
-settlement_required_after_sale: true
-trust_at_risk: true
-```
-
-The model should treat credit as action capacity with attached obligation.
-
----
-
-## 7. Incorrect Model Behavior
-
-The model should not:
-
-- treat credit as free goods
-- ignore deferred payment
-- calculate profit before settlement
-- assume credit is available to every actor
-- ignore trust if payment is late
-- ignore witness, reputation, or collateral
-- treat paper profit as liquid coin
-
----
-
-## 8. Layer-0 Concepts Used
-
-This example uses:
-
-- `CORPUS-0003-money-has-purchasing-power`
-- `CORPUS-0004-cost-includes-more-than-purchase-price`
-- `CORPUS-0005-profit-is-sale-minus-total-cost`
-- `CORPUS-0007-information-arrives-unevenly`
-- `CORPUS-0009-liquidity-differs-from-wealth`
-- `CORPUS-0010-credit-depends-on-trust`
-- `CORPUS-0012-every-venture-risks-loss`
-- `CORPUS-0020-posture-changes-by-audience`
-
----
-
-## 9. Success Condition
-
-If the model sees a trader act without immediate coin and still tracks deferred obligation, trust, settlement timing, and final arithmetic, this file is functioning correctly.