Portage and Path Dependence.

Area of Science:

• Geography
• Economic History
• Environmental Studies

Background:

• Portage sites, especially along the fall line, were historically crucial for waterborne transport and early industrialization.
• The fall line is a geomorphological feature in the southeastern U.S. where rivers transition from rapids to navigable waters.
• These sites historically attracted commerce and manufacturing due to transportation and power advantages.

Purpose of the Study:

• To examine the continuing importance of historical portage sites over time.
• To interpret the enduring significance of these sites through the lens of path dependence.
• To contrast explanations of path dependence using sunk costs and returns to scale.

Main Methods:

• Analysis of historical portage sites across the U.S. South, Mid-Atlantic, and Midwest.
• Inclusion of sites located on the fall line geomorphological feature.
• Interpretation of findings using economic theories of path dependence, sunk costs, and economies of scale.

Main Results:

• Portage sites, including those on the fall line, demonstrate a continuing importance despite the obsolescence of their original advantages.
• The enduring significance of these sites is interpreted as a manifestation of path dependence.
• Explanations involving sunk costs interacting with decreasing versus increasing returns to scale are contrasted.

Conclusions:

• Historical economic advantages at portage sites, particularly along the fall line, create a path dependence that maintains their importance over time.
• Sunk costs and the nature of returns to scale (decreasing vs. increasing) are key factors in understanding this path dependence.
• The study highlights how initial geographical and economic factors can have long-lasting impacts on land use and development.