# Water-Carriage

## Definition

The transportation of goods by navigable rivers, canals, and sea routes. Smith identifies water-carriage as vastly superior to land-carriage in cost-efficiency, demonstrating that a ship crewed by six to eight men can transport the same quantity of goods as fifty waggons requiring a hundred men and four hundred horses. This cost advantage means that water-carriage dramatically expands the effective market available to producers, enabling finer division of labour.

## Source Chapter

Book 1, Chapter 3: "That the Division of Labour is Limited by the Extent of the Market"

## Context

Water-carriage is the chapter's primary mechanism for explaining geographic variation in economic development. Smith argues that civilisation and industry naturally arise first on sea-coasts and navigable rivers because water transport opens "a more extensive market... to every sort of industry than what land-carriage alone can afford it."

## Economic Domain

Exchange

## Smith's Original Wording

> "As by means of water-carriage, a more extensive market is opened to every sort of industry than what land-carriage alone can afford it, so it is upon the sea-coast, and along the banks of navigable rivers, that industry of every kind naturally begins to subdivide and improve itself."

## Modern Interpretation

This is an early articulation of how transportation costs shape economic geography. Modern trade theory and economic geography (Krugman's New Economic Geography) formalise the same insight: reductions in transport costs expand effective market size, enabling agglomeration economies and deeper specialisation.