Samuelson's Iceberg Model
Updated 2026-08-15
INTRODUCTION
English translation pending.
CORE DEFINITION
Introduced by Paul Samuelson as a modeling device in international trade, the iceberg formulation treats transport cost as a share of the good that disappears in transit rather than as a separate service. Shipping one unit requires dispatching more than one unit, and the melt fraction rises with distance. The core claim is that trade costs can be internalized into the good itself, which simplifies models. The qualification is that the iceberg is an abstraction covering all trade frictions, not a literal description of logistics.
SCAFFOLDING EFFECT
Reduce cognitive load
- Use Loss Modeling: Express transmission cost as a proportion of what is sent rather than as a flat fee. - Use Distance Effect: Explain declining trade or influence with distance as rising effective cost. - Use Redundancy Planning: Send more signal than needed at the source so enough arrives at the destination.
Anchor fast decisions
When a fixed fraction of goods is lost in transit, the cost of delivering one unit rises with distance in a smooth multiplicative way, which makes trade volumes decline gradually rather than cut off sharply. Because the loss is proportional rather than fixed, remote destinations face a compounding disadvantage that appears as a distance coefficient in gravity models. Treating friction as proportional also makes the effect easy to combine with production and demand.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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