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docs/training/corpus/Layer_0--Primitive_Facts/CORPUS-0005-profit-is-sale-minus-total-cost.md

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-# CORPUS-0005
-## Profit Is Sale Price Minus Total Cost
-### Status: Training Corpus Seed
-### Layer: Layer_0--Primitive_Facts
-### Purpose: Teach that profit is calculated after all costs are counted, not merely by comparing purchase and sale price
-### Repository Path: docs/training/corpus/Layer_0--Primitive_Facts/CORPUS-0005-profit-is-sale-minus-total-cost.md
-
----
-
-## 0. Principle
-
-Profit is what remains after total cost is subtracted from sale value.
-
-A trader does not profit because the sale price is higher than the purchase price.
-
-A trader profits only if the sale value exceeds every cost created by the venture.
-
-```text
-profit = sale_value - total_cost
-```
-
----
-
-## 1. Roman-Visible Example
-
-A trader buys oil in Ostia for 10 asses.
-
-He sells it in Capua for 18 asses.
-
-At first glance, the gain appears to be 8 asses.
-
-But the venture also required:
-
-- 2 asses for porterage
-- 3 asses for cart space
-- 1 as for storage
-- 1 as for handling at Capua
-
-Total cost:
-
-```text
-10 + 2 + 3 + 1 + 1 = 17 asses
-```
-
-Actual profit:
-
-```text
-18 - 17 = 1 as
-```
-
-The venture succeeded, but only barely.
-
----
-
-## 2. Minimal Profit Structure
-
-Profit requires at least:
-
-1. sale value
-2. purchase price
-3. movement cost
-4. holding cost
-5. transaction cost
-6. loss adjustment
-7. time and opportunity cost where relevant
-
-A sale can look profitable before the full cost is counted.
-
----
-
-## 3. Incorrect Modern Assumption
-
-Incorrect assumption:
-
-> Bought for 10, sold for 18, profit is 8.
-
-Correction:
-
-> Bought for 10, sold for 18, profit is unknown until all costs are counted.
-
----
-
-## 4. Simulation Use
-
-This principle supports:
-
-- venture outcome calculation
-- player feedback
-- price comparison
-- route evaluation
-- break-even analysis
-- false-profit prevention
-- training examples in Layer 1
-
-The model should always distinguish:
-
-- gross spread
-- total cost
-- actual profit
-
----
-
-## 5. Canonical Test
-
-If the model sees:
-
-> Purchase price: 10 asses. Sale price: 18 asses.
-
-It must not immediately answer:
-
-> Profit: 8 asses.
-
-It must ask:
-
-- what was transport cost?
-- what was storage cost?
-- were dues paid?
-- was any product lost?
-- how long was capital tied up?
-- was another better venture missed?
-
-Only after total cost is known can profit be calculated.
-
----
-
-## 6. Success Condition
-
-If the model stops treating the difference between purchase price and sale price as profit, and starts subtracting total cost from sale value, this file is functioning correctly.