Global Trade Analysis Project (GTAP)

The Global Trade Analysis Project (GTAP) is a global network of researchers and policy makers conducting quantitative analysis of international policy issues. GTAP is coordinated by the Center for Global Trade Analysis in Purdue University's Department of Agricultural Economics.

Current Highlights

New Tech Paper

GTAP Technical Paper

Modern Trade Theory for CGE Modelling: the Armington, Krugman and Melitz Models

by Dixon, Peter, Michael Jerie and Maureen Rimmer

This paper is for CGE modelers and others interested in modern trade theory. The Armington specification of trade, assuming country-level product differentiation, has been central to CGE modelling for 40 years. Starting in the 1980s with Krugman and more recently Melitz, trade theorists have preferred specifications with firm-level product differentiation. We draw out the connections between the Armington, Krugman and Melitz models, deriving them as successively less restrictive special cases of an encompassing model. We then investigate optimality properties of the Melitz model, demonstrating that a Melitz general equilibrium is the solution to a global, cost-minimizing problem. This suggests that envelope theorems can be used in interpreting results from a Melitz model. Next we explain the Balistreri-Rutherford decomposition in which a Melitz general equilibrium model is broken into Melitz sectoral models combined with an Armington general equilibrium model. Balistreri and Rutherford see their decomposition as a basis of an iterative approach for solving Melitz general equilibrium models. We see it as a means for interpreting Melitz results as the outcome of an Armington simulation with additional shocks to productivity and preferences variables. Details

GTAP Technical Paper No. 36

GTAP in the News

Studies, stories and more by GTAP Network members using GTAP data.

World Bank Group logo
World Bank reports on regional crises

The World Bank has recently completed two studies on the economic impacts of regional crises partially relying on the use of GTAP-based CGE models.

The first study is a World Bank working paper on the "Economic effects of the Syrian war and the spread of the Islamic state on the Levant" by Dr. Elena Ianchovichina and Dr. Maros Ivanic that was cited by the Financial Times, the Wall Street Journal, Associated Press and Reuters as well as broadly cited in the local press and media. The authors’ op-ed was also published by Al Jazeera.

A second study focuses on The Economic impact of the 2014 Ebola epidemic: short and medium term estimates for West Africa, which was similarly cited by the Financial Times.

The Center is always interested to learn when GTAP-based analysis is recognized on a platform, such as the piece(s) above. If you have similar items you wish to share with the Center and broader GTAP community, please feel free to email them to Ginger Batta.
18th Annual Conference on Global Economic Analysis
"Information for the Policy Maker: Practical Economic Modelling for Tomorrow"
June 17-19, 2015  |  Melbourne, Australia

Melbourne Convention Centre
Melbourne Convention Centre
Dates/Deadlines (EST)
Abstracts / Session Proposals Jan 15
Abstract Review Jan 21-Feb 15
Acceptance Notifications late Feb
Final Papers Apr 15
Registrations Apr 30
Payments May 7

The Center for Global Trade Analysis is pleased to partner with Centre of Policy Studies (CoPS), Victoria University, to organize this event.

The goal of the conference is to promote the exchange of ideas among economists conducting quantitative analysis of global economic issues. Particular emphasis will be placed on applied general equilibrium methods, data, and application. Related theoretical and applied work is also welcome.
23rd Annual Short Course in Global Trade Analysis
"Introduction to Applied General Equilibrium Analysis in a Multi-Region Framework"
July 11-17, 2015   |   West Lafayette, Indiana, USA

Purdue University
Purdue University
Dates/Deadlines (EST)
Applications Feb 15
Acceptance Notifications March
Online Course Apr 27-Jun 28
The course consists of a mix of daily lectures, lab assignments and informal discussions designed to introduce participants to the basic features of the GTAP Model and data base allowing participants to leave with the capability of designing, conducting and analyzing their own simulations. The objectives of the course are:
  • To introduce participants to a standardized framework for conducting global policy analysis in an applied general equilibrium setting
  • To provide participants with ample hands-on training with software that has been tailored to global economic analysis
  • To give participants the opportunity to interact with economists working on global trade and resource use issues, and become part of an international network
2015 Short Course in Dynamic Global Trade Analysis
"Dynamic Modeling and Applications in Global Economic Analysis"
October 9-14, 2015   |   West Lafayette, Indiana, USA

Purdue University
Purdue University
Dates/Deadlines (EST)
Applications Apr 5
Acceptance Notifications May
Online Course Aug 10-Sep 27
The course consists of a mix of daily lectures, lab assignments and informal discussions designed to introduce participants to the basic features of the Dynamic GTAP Model allowing participants to leave with the capability of conducting and analyzing their own GDyn simulations. The objectives of the course are:
  • To introduce participants to a dynamic model designed for conducting global trade analysis in an applied general equilibrium setting
  • To provide participants with ample hands-on training with software that has been tailored for undertaking analysis using a dynamic recursive model
  • To give participants the opportunity to interact with economists working on global trade and resource use issues using a dynamic modeling framework
2015-2 GTAP 101 Course
"Introduction to Computable General Equilibrium Modeling"
September 14 - October 30, 2015


Cover image for Computable General Equilibrium Models
Dates/Deadlines (EST)
Applications Apr 1-Jun 28
Acceptance Notifications August


Coursework based on:
Introduction to Computable General Equilibrium Models
by Mary E. Burfisher


The objective of GTAP 101 is to engage participants in an active, team-based process of learning about the GTAP CGE model and its use in applied economic policy analysis. The curriculum is geared to advanced undergraduates, graduates and professionals. Following the course, participants will be entry-level modelers and more informed consumers of CGE-based analyses.

Announcements

Submit announcements to contactgtap@purdue.edu.

GTAP Events Deadline
Dynamic Short Course - ApplicationsApr 5, 2015
Conference - Final PapersApr 15, 2015
Conference - RegistrationApr 30, 2015
Conference - PaymentMay 7, 2015


Network Events/Notices Deadline
ICCG Webinar - H20 Challenges Ag SectorMar 5, 2015
EcoMod Modeling School – AmericasMar 23, 2015
Dynamic CGE course USAGE modelApr 1, 2015
GLOBE Model Short CourseJun 1, 2015
STAGE Model Short CourseJun 1, 2015


Job/Professional Opportunities Deadline
ADVANCE Project - Call for ParticipationMar 11, 2015
NZIER - CGE ModellerMar 20, 2015

GTAP Support

GTAP Network members in need of technical support are encouraged to use the following avenues to request assistance. General, non-technical inquiries may be addressed to contactgtap@purdue.edu.

  • GTAP FAQs
    The Center for Global Trade Analysis maintains a searchable repository of frequently asked questions on many different aspects of GTAP.

  • GTAP Support Email
    gtapsupport@purdue.edu is an account monitored by the Center for Global Trade Analysis' data team. Network members can email to reach a GTAP staff member for technical support on any GTAP product.

  • GTAP-L Mailing List
    GTAP-L is an email-based list to which many members of the GTAP Network subscribe in order to receive updates on the GTAP Data Base, model, events, jobs and technical assistance. For further information, to subscribe or to access a searchable archive of GTAP-L messages, please visit the GTAP-L Mailing List homepage