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- Publications
- Influence
The nature and growth of vertical specialization in world trade
- David Hummels, J. Ishii, K. Yi
- Economics
- 1 June 2001
Dramatic changes are occurring in the nature of international trade. Production processes increasingly involve a sequential, vertical trading chain stretching across many countries, with each country… Expand
The Variety and Quality of a Nation's Exports
- David Hummels, P. Klenow
- Economics
- 1 May 2005
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… Expand
Toward a Geography of Trade Costs
- David Hummels
- Economics
- 1 January 1999
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… Expand
Transportation Costs and International Trade in the Second Era of Globalization
- David Hummels
- Economics
- 1 July 2007
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… Expand
Shipping the Good Apples Out? An Empirical Confirmation of the Alchian‐Allen Conjecture
- David Hummels, A. Skiba
- Economics
- Journal of Political Economy
- 1 June 2002
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… Expand
Monopolistic Competition and International Trade: Reconsidering the Evidence
- David Hummels, J. Levinsohn
- Economics
- 1 June 1993
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… Expand
Trade Responses to Geographic Frictions: A Decomposition Using Micro-Data
- Russell H. Hillberry, David Hummels
- Economics
- 1 May 2005
A large literature has shown that geographic frictions reduce trade, but has not clarified precisely why. We provide insights into why such frictions matter by examining which parts of trade these… Expand
Have International Transportation Costs Declined
- David Hummels
- Economics
- 13 January 2003
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… Expand
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How Confident Can We Be in Cge-Based Assessments of Free Trade Agreements?
- T. Hertel, David Hummels, M. Ivanic, Roman Keeney
- Economics
- 1 May 2004
Computable General Equilibrium models, widely used for the analysis of Free Trade Agreements (FTAs) are often criticized for having poor econometric foundations. This paper improves the linkage… Expand
Vertical Specialization and the Changing Nature of World Trade
- David Hummels, D. Rapoport, K. Yi
- Economics
- 1 June 1998
A major feature of globalization has been the enormous increase in international flows of goods and services: countries are now trading much more with each other. In this article, the authors… Expand