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docs/training/corpus/Layer_1--Worked_Examples/CORPUS-0002-one-as-margin-and-break-even.md

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-# CORPUS-0002
-## One-As Margin And Break-Even
-### Status: Training Corpus Seed
-### Layer: Layer_1--Worked_Examples
-### Purpose: Teach that a tiny sale margin can disappear once small costs, delay, or loss are counted
-### Repository Path: docs/training/corpus/Layer_1--Worked_Examples/CORPUS-0002-one-as-margin-and-break-even.md
-
----
-
-## 0. Scenario
-
-A trader buys a small good in Ostia for 3 asses.
-
-He expects to sell it in Capua for 4 asses.
-
-At first glance, the venture appears profitable.
-
-The expected spread is only 1 as.
-
-A one-as margin is fragile.  
-Almost any additional cost can erase it.
-
----
-
-## 1. Known Facts
-
-| Fact | Value |
-|---|---:|
-| Origin | Ostia |
-| Destination | Capua |
-| Purchase price | 3 asses |
-| Expected sale price | 4 asses |
-| Gross spread | 1 as |
-
----
-
-## 2. First Incorrect Calculation
-
-A weak model may calculate:
-
-```text
-4 asses - 3 asses = 1 as profit
-```
-
-This is incomplete.
-
-The calculation ignores every cost required to move, hold, protect, or sell the good.
-
----
-
-## 3. Break-Even Point
-
-The trader breaks even only if total cost is 4 asses or less.
-
-```text
-sale value = 4 asses
-break-even total cost = 4 asses
-```
-
-Since the purchase price is already 3 asses, the trader can spend only 1 additional as before profit disappears.
-
-```text
-maximum additional cost before loss = 1 as
-```
-
----
-
-## 4. Cost Variants
-
-### Variant A — No Added Cost
-
-```text
-purchase price = 3 asses
-sale value = 4 asses
-profit = 1 as
-```
-
-The venture succeeds.
-
-### Variant B — One Additional As
-
-```text
-purchase price = 3 asses
-handling = 1 as
-total cost = 4 asses
-sale value = 4 asses
-profit = 0
-```
-
-The venture breaks even.
-
-### Variant C — Two Additional Asses
-
-```text
-purchase price = 3 asses
-handling + delay = 2 asses
-total cost = 5 asses
-sale value = 4 asses
-loss = 1 as
-```
-
-The venture fails.
-
----
-
-## 5. Why Small Margins Matter
-
-A small margin is not useless.
-
-It may still be acceptable if:
-
-- the trader is already sending a cart
-- the good fills unused space
-- the sale builds trust
-- the buyer may become a repeat contact
-- the good is part of a larger bundle
-- the trader has no better use for the coin
-
-But a small margin is dangerous if:
-
-- transport must be paid separately
-- storage is uncertain
-- delay is likely
-- the destination price is stale
-- the buyer may refuse
-- rivals may arrive first
-
----
-
-## 6. Correct Model Behavior
-
-The model should reason:
-
-- a one-as spread is not automatically profit
-- break-even depends on total cost
-- tiny margins are fragile
-- low-value goods may still matter when bundled
-- context determines whether small gain is worth risk
-
----
-
-## 7. Incorrect Model Behavior
-
-The model should not:
-
-- treat every positive spread as safe profit
-- ignore small costs because they look minor
-- assume one-as profit is always worth pursuing
-- assume tiny trades are meaningless
-- ignore bundling, repeat contact, or unused capacity
-
----
-
-## 8. Layer-0 Concepts Used
-
-This example uses:
-
-- `CORPUS-0002-goods-have-local-prices`
-- `CORPUS-0003-money-has-purchasing-power`
-- `CORPUS-0004-cost-includes-more-than-purchase-price`
-- `CORPUS-0005-profit-is-sale-minus-total-cost`
-- `CORPUS-0006-delay-is-economic-cost`
-- `CORPUS-0012-every-venture-risks-loss`
-
----
-
-## 9. Success Condition
-
-If the model sees a one-as spread and immediately asks whether total cost leaves any margin, this file is functioning correctly.