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docs/training/corpus/Layer_0--Primitive_Facts/CORPUS-0004-cost-includes-more-than-purchase-price.md

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-# CORPUS-0004
-## Cost Includes More Than Purchase Price
-### Status: Training Corpus Seed
-### Layer: Layer_0--Primitive_Facts
-### Purpose: Teach that the cost of a venture includes every expense required to acquire, hold, move, protect, and sell the good
-### Repository Path: docs/training/corpus/Layer_0--Primitive_Facts/CORPUS-0004-cost-includes-more-than-purchase-price.md
-
----
-
-## 0. Principle
-
-Purchase price is not total cost.
-
-A trader who buys a good must also consider the cost of making that good available for sale in another place or time.
-
-Total cost may include:
-
-- purchase price
-- porterage
-- cart hire
-- animal feed
-- storage
-- dues
-- losses from damage
-- delay
-- spoilage
-- guards or escorts
-- payments to clerks, witnesses, or handlers
-
-A low purchase price may still produce a bad venture if the remaining costs are high.
-
----
-
-## 1. Roman-Visible Example
-
-A trader buys oil in Ostia for 10 asses.
-
-He plans to sell it in Capua.
-
-The purchase price is only the first cost.
-
-He may also pay:
-
-- 1 as to move the amphora from seller to storage
-- 2 asses for storage before departure
-- 4 asses toward cart space
-- 1 as for handling at arrival
-- 1 as lost through leakage or breakage risk
-
-The oil did not cost him 10 asses.
-
-It cost him 19 asses before he could sell it.
-
----
-
-## 2. Minimal Cost Structure
-
-A venture cost requires at least:
-
-1. acquisition cost
-2. movement cost
-3. holding cost
-4. transaction cost
-5. loss or damage risk
-6. time cost
-7. opportunity cost
-
-A trader must count all costs that exist because the venture exists.
-
----
-
-## 3. Incorrect Modern Assumption
-
-Incorrect assumption:
-
-> If a trader buys for 10 asses and sells for 14 asses, he earns 4 asses.
-
-Correction:
-
-> He earns 4 asses only if there are no other costs. If movement, storage, dues, or damage cost more than 4 asses, the venture loses money.
-
----
-
-## 4. Simulation Use
-
-This principle supports:
-
-- venture accounting
-- transport cost
-- storage cost
-- spoilage and breakage
-- taxes and dues
-- delay penalties
-- comparison between possible ventures
-- failed trades that looked profitable at purchase
-
-The model should not calculate profit from purchase price alone.
-
----
-
-## 5. Canonical Test
-
-If the model sees:
-
-> Buy oil for 10 asses. Sell oil for 14 asses.
-
-It must ask:
-
-- what did it cost to move the oil?
-- what did storage cost?
-- were dues paid?
-- was any quantity lost?
-- how long was capital tied up?
-- what other venture was missed?
-
-Only then can total cost be known.
-
----
-
-## 6. Success Condition
-
-If the model stops treating purchase price as total cost and starts counting every burden created by the venture, this file is functioning correctly.