David Hummels

Publications95
h-index33
Citations12,954
Highly Influential Citations1,236
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The nature and growth of vertical specialization in world trade
The Variety and Quality of a Nation's Exports
Large economies export more in absolute terms than do small economies. We use data on shipments by 126 exporting countries to 59 importing countries in 5,000 product categories to answer the…
Toward a Geography of Trade Costs
What are the barriers that separate nations? While recent work provides intriguing clues, we have remarkably little concrete evidence as to the nature, size, and shape of barriers. This paper offers…
Transportation Costs and International Trade in the Second Era of Globalization
While the precise causes of postwar trade growth are not well understood, declines in transport costs top the lists of usual suspects. However, there is remarkably little systematic evidence…
Shipping the Good Apples Out? An Empirical Confirmation of the Alchian‐Allen Conjecture
Alchian and Allen show that a per unit transactions cost lowers the relative price of, and raises the relative demand for, high‐quality goods. We extend their theory, deriving a relationship between…
Monopolistic Competition and International Trade: Reconsidering the Evidence
In this paper, we test some propositions about international trade flows that are derived from a model of monopolistic competition developed by Elhanan Helpman. We investigate whether the volume of…
Have International Transportation Costs Declined
July 1999 While the precise causes of post-war trade growth are not well understood, declines in transport costs top the lists of usual suspects. However, there is remarkably little systematic…
Trade Responses to Geographic Frictions: A Decomposition Using Micro-Data
Time as a Trade Barrier
A large and growing share of international trade is carried on airplanes. Air cargo is many times more expensive than maritime transport but arrives in destination markets much faster. We model…
How Confident Can We Be in Cge-Based Assessments of Free Trade Agreements?
With the proliferation of Free Trade Agreements (FTAs) over the past decade, demand for quantitative analysis of their likely impacts has surged. The main quantitative tool for performing such…
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